Hydrocal does not slough off which makes it easier to work with and more durable. Clear editor. Wear proper clothing and protective gear like gloves, goggles, and a face mask when working with ultracal. As this happens, it changes from hemihydrate to dihydrate. It is a high-quality, quick-setting plaster that is usually normally used with gauged lime putty. Way stronger. Hydrocal is stronger as compared to plaster of Paris. You first need to tap the side of the container to disperse the powder and also to remove air bubbles. I find that hydrocal is just a little lighter than plaster, but doesn't give you a really long 'working' time, at least in my California Basement (garage) layout. Decorating is poetry. This material is specifically designed for thin sections. It also has a darker color than the plaster I use, so I figured it could affect the final outcome of the colors of washes I planned on using on my rockwork. Hydrocal is mainly composed of plaster of Paris and a small amount of Portland cement. Pasted as rich text. Plaster statues are made from a mix of heat-treated gypsum powder and water that hardens when it dries. Plaster of Paris is gypsum plaster that is made from a fine white powder that hardens when it is moistened and dried. You can also check out this article that we have shared that discusses the difference between hydrocal and ultracal. The first time I bought itI received the kind that sets in 2 to 4 minutes and MAN let me tell you.. you'll learn to work very fast with that stuff. Hydrocal is stronger as compared to plaster of Paris. I truly believe that all you have to do is 'wet' your mold down. Fast-setting alpha gypsum cement designed for strong, resilient glass-reinforced product fabrication. Excessive amounts can affect the overall drying and curing of the product. Modeling B&O- Chessie Bob K. www.ssmrc.org. Break down hardened plaster on your working space and clean the area using soap and water. You see the way the spoon is? I have already commited about $2500 on wood for this train set, 2 loomotives, some cars, construction insulating foam, paints, paint brushes track, power supplies hehehwhy am I telling you all this, you all know how it works well my wad of cash is gone so im now ready to do things the cheapest way. On the other hand, it is still a plaster that is heavy, dense, and can shatter when dropped. It will do just fine IMO. We hope to inspire you. I had to chisel some off the sides to remove the cast. Plaster molds can also be used to cast wax, if the mold is well-soaked beforehand. We have shared an in-depth discussion about the topic. Patching Compound -- Made with calcium sulphate, limestone and crystalline quartz, patching compound sets in about 20 minutes and makes durable repairs on wood . While some of their components are not the same, both are made for the same purposes like casting and molding. Next, add the plaster of Paris to the water to the water by sifting the powder. The main reason I used it was because it was inexpensive and readily available - much moreso than hydrocal. All casts must be dried as quickly as possible so that they can develop maximum physical properties. It usually will only lightly tint. Both have pros and cons so you need to make sure that you weigh out your options to make the best choice based on the project that you are working on. 10 replies. I wanted its superior strength. Moreover, ultracal is noncombustible. But in short using the hyrdrocal/dental plaster. Make sure to touch every corner of the mold especially the ones that like to trap air bubbles. Most of the time, we choose a material for the project that we are working thinking that it is an excellent choice, only to find out in the end that the material is not the correct one. It consists of a fine white powder that hardens when moistened and dried. Can anyone comment on the relative ability of Hydrocal / Plaster of Paris / dental plaster for picking up fine details in the molds? But it is awfully good for rock castings. You need to let it soak for about one to two minutes. All that you need to do is to follow the instructions written on the package on how to properly mix and handle both materials. To avoid splashing the mixture, use the stirring stick as a guide when pouring the hydrocal into the molds. Check out the video to learn more about the topic. Try buying it in 50 lb bags from a building supply houseNot usually at a Home Depot, look for the store specializing in lath and plaster supplies (there is usually one in most towns) Much cheaper in bulk. I am never going back to any plaster or hydrocal product. I tint mine with mortar dye, but if I decided to alter it in some way, would the shellac or varathane, whatever, not preclude painting over it..or will acrylics "take"? Use a mixing container that can fit the amount of mixture that you will make. As compared to most plasters, hydrocal is stronger. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. Mixing ultracal with water produces a chemical reaction. Make sure to break up any lumps that form in the mixture using a spoon. Take note that plaster that does not slough off is vital when it comes to making long life scenery. I already had a two pound carton of Woodland Scenics Hydrocal Lite at $8.49. Yes.. that is the weakest part of a mold.. a thin mold approach that I use. Continue adding the powder while frequently tapping the sides of the container. Pour 1 cup of water into the mixing bowl. For general wall and ceiling repair. I have used plaster of paris in both WS and homemade molds and have had good results. When plaster of Paris sloughs off, it results in dust and chips continously. UltraCal-30 is just plain old plaster of paris, with some portland cement, usually in a 8:1 ratio, so you can make your own from a trip to the local hardware store. Make sure that you read and follow the handling and directions on how to use hydrocal according to what is written in the package. Lightweight hydrocal is a tough, quick-setting product. You can heat ultracal, but you need to follow heating instructions. Step 1: Pour 1 cups of lightweight hydrocal slowly into cup of water. Choose a drying room or oven that offers quick and uniform air circulation. Thats it.. btw.. It is ideal that you wait at least a week. So that makes the P-of-P 66 cents a pound and the H-Lite $4.25 a pound. This helps slow down the absorption process. I've painted over the shellac with acrylics and enamel paint. Make sure that the hydrocal is completely dispersed in water before mixing. Shake off the excess water and lay the molds on the table to the floor. Plaster of Paris is an ideal material to use for craft and sculpture projects. If you pick the wrong type of bowl.. you'll have problems cleaning it. Find out how to do this by reading the article that we have shared titled, how to make plaster of Paris stronger. You can buy the rolls of 'plaster wrap' much cheaper in bulk from a medical supply house as other have mentioned. It was a waste of time and money. If you use open cell foam (styrofoam) for a castform, you're going to bein trouble trying to free the cast from the form. wow, always a lot of info on this forum! The first step is measuring. I believe these are offered commercialy now. Why?> When you're done.. and the plaster is dried to your bowl.. just add water.. look closely at the bow.. you'll see a thin film of plaster.. that just slides up and off the rim of the bow. how about ballast? In the video, how to mix and use ultracal is discussed. Hydrocal and ultracal are gypsum cement and both have different properties. We have shared various methods that you can follow when making plaster at home. If this is the only foam you have at your disposal, you can line the form with packing tape. Well, the thing fell off the table and landed on the tile floor. Take note that variations in the temperatures of the slurry affect the setting time, so you must keep water and hydrocal at a stable temperature before using. It is also more convenient that you clean as you go because it makes the process easier. I am currently trying to get more familiar with tecstone. Alternatives that you can choose from if you do not want to use plaster of Paris includes mixing lime and water, soy powder and water, chalk and water, and acrylic undercoat. I would not be able to breakit up.. its that strong. Hydrocal is stronger than plaster but is as easy to use. link to Should You Leave Your Shower Curtain Open or Closed? We have also shared this article that discusses if perfect cast is the same as plaster of Paris. It demonstrates mixing tips for white hydrocal. You need to use water at temperatures between 70 and 100 Fahrenheit. As an Amazon Associate, we earn from qualifying purchases. They just re-package the same materials you can buy elseware in bulk. Check out the rest of the article below for more tips and ideas. Beats the heck out of Walmart prices/unit weight/volume. We hope to inspire you. can I get this stuff in bulk? Moreover, how long you mix the slurry will affect the setting time. For easy and convenient shopping, you can look at online stores for a wide array of products that you can choose from. Take a Ride on the Reading with the: I don't know why.. I use 'Dental Plaster' its cheaper.. and I believe the same as Hydrocal. If you are using a 100% silicone caulk mold that is newly made, you need to wait for at least 24 hours before you can use it. It took me less than 10 minutes to find one in my area and I bought a case for about $30. I also use Gypsolite (LHS, same big jar) which has a nice gritty texture. Ultracal is a good choice if your work needs accuracy and a good amount of surface hardness. | Guide for Beginners. Powered by Invision Community. Hydrocal has excellent strength which helps lessen breakage when the plaster cast is removed from the mold. Let it soak for one to two minutes. I used Hydrocal White for many years with no seriouscomplaints, but more recently have been using a product called Tecstone (It's a dental plaster). As compared to plaster of Paris, hydrocal takes a lot more details and they do not slough off so you do not have to deal with lots of dust and chips. I find Plaster of Paris too soft, and subject to scratches and breakage. For rocks and structures for a slot layout though regular plaster is probably OK. Save. It discusses the materials and process of plaster casting. You should use some kind of tiles regardless of the type of plaster, ceramic or glass tiles. Those using plaster, could you please tell me the ratio you are using. Pick a smooth bowl. To help you get started, we will discuss the differences between both materials below. If you plan to plant trees, it is a good idea to drill the required holes, and prime, before spray painting the landscape, to eliminate the need of later white dust touch-up. Hydrocal and ultracal sets quickly. How do you prepare plaster of Paris? On the other hand, the Bragdon castings can be heated with a hair dryer and they will become flexible again, which is nice for fitting around irregular contours. Use acrylic washes to color castings, repeating until satisfied. You can also check out this article that we have shared that discusses if hydrocal is stronger than plaster of Paris. Hydrocal Plaster for Scenery, Dioramas, Dentistry and Mold Casting Plaster Resealable Bag Great for Model Railroads (25 lb) 4.6 4.6 out of 5 stars (23) . For a head cast you will absolutely want hydrocal. Copyright 1996 - 2022 Maestronet The reason for this is that the chemicals in the water can create unwanted reactions when it is mixed with the plaster. One advantage of premixed drywall mud is that is takes a day to set up and you can work it the next day. This will prevent air bubbles and will also create a uniform and smooth surface. People who have used both materials have varied inputs when it comes to the difference between hydrocal and plaster of Paris. If I waited until the next day.. Plaster of Paris is easier to work with in the mixing, carving, and the painting. Always do your own research before making important decisions. We have shared tips and ideas about the topic that you can refer to. Should You Leave Your Shower Curtain Open or Closed? To help you get started, we will discuss two of the common plasters used which are hydrocal and plaster of Paris. The difference between hydrocal and plaster of Paris is that hydrocal is stronger. Hardens like a rock quickly. a rock and gravel company maybe? Sounds to me like you are buying the WS pre-packaged Hydrocal. 'Surface Tension' yes.. that is what is keeping the plaster really getting into and adhering to the mold. Decorating is poetry. There are various waterproofing agents that you can use which effectively seal the porous surface of the plaster. Kc Bodycasting shared the video below on YouTube. It has a similar formula as hydrostone, duracal, and ultracal. Member since January 2003; From: Ridgeville,South Carolina; 1,294 posts Hydrocal vs. Plaster of Paris. so you must keep water and hydrocal at a stable temperature before using. Ah to make this very short. discusses the difference between hydrocal and ultracal, Provides long workability as setting expansion is twice that of molding plaster and pottery plaster, Ideal for both hollow and solid casting lamp bases, moldings, general castings, and figurines, Provides a great value to performance ratio, Requires 45 parts water by weight per 100 parts plaster, Has a stark white color which makes it ideal for accepting colorants. Ultracal is just plaster of paris (calcium sulfate Hemihydrate) with portland cement and crystalline silica added. I can only tell you what I know.. and what I do. We hope that this article has helped you learn more about hydrocal and help you get ready for your next sculpting or molding project. I use shellac for this purpose. The powdered dye is added to the dry plaster to approximate end color of choice. I tried some WS lite weight hydrocal, but it was no better than PofP and cost WAY more. If you want the cast to be completely cured before you remove it from the mold, wait until it feels dry and warm. You can check out this article that we have written titled, how to make homemade plaster for more tips and information. It is easy to do especially when you are working with small batches. so I am comfortable with this for scenery and rock molds. Like any other gypsum product, hydrocal will vary slightly from batch to batch as far as the amount of water required for mixing. Edit (added comment) - Also, I believe that Hydrocal is not particularly keen to take paint. What is plaster of Paris? Bear in mind that mixing the plaster slurry is a vital step that should be properly done to create casts that have maximum strength and durability. I wasn't pleased with the results. If you think you have it right, your standards are too low. Unless you have a portable layout,I don't see where weight would be a problem unless I'm overlooking somethingcomments? Then really dry it. Weigh the water and hydrocal according to the consistency that you need. For a mold that will cast 5 or 6 pieces? We have also shared this article that discusses what hydrocal is made of. Mix the plaster into the water before adding the glue. Hydrocal provides twice the compressive strength of plaster and is ideal for thin and delicate sections where high green strength is needed. Upload or insert images from URL. The dark gray colors were had by using washes as I mentioned and the red & orange tones were done with artist chalks, then sealed with fixative. The difference between hydrocal and ultracal is that ultracal is harder and denser. I prime neither when painting. To me plaster of paris is easier to work with and cheaper. . If you continue to use this site we will assume that you are happy with it. Scrape the excess plaster off with s metal straight edge to achieve a nice smooth back on the castings. You seldom need plaster of Paris to patch drywall. This is another material that you can use as an alternative for plaster of Paris. Plaster of Paris (USG No. They can be set at about 25 to 35 minutes. It would do so after priming. Aside from that, hydrocal also takes more detail and does not slough off. I will use that in the future. Mix the glue to the water and plaster mixture. It takes washes well. The mixed consistency will vary depending on its use. -Crandell Reply HHPATH56 Member since March 2007 947 posts Let us learn more about these steps below. Just my opinionTim. I wanted to know what is the difference? Once they have set and are fully fried, they have the best strength. We have shared an in-depth discussion about the topic. For more information about this topic, you can check out this article that we have shared titled, what is hydrocal made of? Choose an ingredient that you are most comfortable working with. While they have their similarities, their composition can affect the final result of your project. Falling in Art 1lb Plaster of Paris Powder - Plaster Hand Mold Casting Kit Powder, Gypsum Cement, Pottery & Ceramic Plaster Powder for Crafts, Sculpture, Diorama and Home Decor. Good luck. WHITE HYDROCAL - Used for making plaster objects, a neutral gypsum cement having a normal set of 25 minutes. The castings can set in about 15 to 20 minutes. Hydrocal and Ultracal 30 are also used in the pottery studio. Strictly my O/P as some doe paint hydrocal to seal it first. Do not worry much because it will eventually combine into the mixture. No. Hydrocal is made for making solid and hollow castings. Both are plaster but have their differences. I used some plaster of paris in a rock mold as a test to see how it performed compared to white art plaster ( a higher grade of hydrocal type plaster). In my last case, I had to do a full cast of the cello back attached to ribs and table. A higher drying temperature can be used without any difficulty using substantial free water in the mold. We have shared helpful tips and ideas that you can refer to. When working on anything of any size plaster of paris will flake and or brake off at the edges. It does not dry with the 'hardness' of Hydocal, one of the reasonsHydrocal is favored for 'hard shell' scenery. While we strive to provide quality information, we cannot guarantee its accuracy. How do you prepare plaster of Paris? Used Hydrocal for the first time 2 nights ago for a full back cast of a Gagliano cello. Now all I do is, just paint a 1/4 thickness of plaster.. lay in a cloth strip and done. If you want it to be thoroughly cured before de-molding, you need to wait until it feels warmish and dry. Not the best photo.. but study this sheet.. As compared to plaster of Paris, hydrocal takes a lot more details and they do not slough off so you do not have to deal with lots of dust and chips. You know the jagged parts of, the mold that will stick out. Our supplier has the plaster in 99# bags. It is also an extremely wear-resistant material. Make sure that the hydrocal is fully dispersed in the water before mixing. I buy somebody else's Hydrocal in a big jar. The average time that it takes for ultracal to set is about 25 to 35 minutes. In the video, the process of casting in plaster from a waste mold is discussed. You can also check out this article thatdiscusses if hydrocal expands. Nasher Sculpture Center shared the video below on YouTube. It might add up over many castings applied to a significant layout, but I'd bet it doesn't add up to more than maybe five or six pounds once it is dry and in place on most layouts. Your results and mileage may be different, of course. Leaving the shower curtain open or closed has long been a debate for a lot of people. We have shared the step-by-step methods on how to mix glue with the plaster. So far, it is strong. As compared to ultracal, hydrocal is softer so you can be able to work on it longer. Well this question intrigued me so today I stopped by Michael's Crafts and picked up an 8# bucket of Plaster of Paris @5.29. Moreover, hydrocal does not slough off as compared to plaster of Paris. Thank you for reading! On the other hand, it is not as durable as compared to ultracal. So, the jury is still out on the subject for me. What I like to do w/ that huge bag of Hydrcal is to rebag in smaller more managable amounts. I tried use of colors mixed in the Hydrocal, and found that enough color to make any appreciable difference weakened the mixture after set-up, and any lesser amount resulted in pastel, not colored, rocks. They are easy to use and durable. We have also shared this article that discusses what hydrocal is made of. I know this.. You can make plaster of Paris stringer. We have found out that hydrocal is stronger than plaster of Paris and can also take a lot of detail. Brick In The Yard Mold Supply shared the video below on YouTube. They produce less heat as compared to other products. Take note that hydrocal has a high green strength which allows it to lessen breakage during removal of the casting from the molds. Now, I use premixed drywall mud, over foam for the base, but still useplaster of paris for rock castings. Aside from that, they are also durable and lightweight. You have reached the end of this article that discusses the difference between hydrocal and plaster and Paris. You need to cover the work area using newspapers. I am happy with the detail.. and this is the best shot I can show you. Combining both ingredients cuts the setting time shorter. Hydrocal is stronger than plaster of Paris. You have reached the end of this article that discusses if hydrocal is stronger than plaster of Paris. I use 2 parts plaster of paris to 1 part water. It is the perfect choice for making a solid and hollow casting of figurines, general sculptures, and commercial casts. It costs me about Cdn$19/bag, and I am on my third already doing hardshell. I have poured large faces of rocks.. using less and less dental plaster. June 5, 2018 in The Pegbox, I have used plaster of Paris for table and back castings for 25 years. I even took pics to see how much detail there was.. and how easy it was to pull Dental plaster out of the mold. Even though your plaster mix has been mixed correctly with no bubbles.. you can and will still get an impartial filling of the cracks and detail. We have also learned the difference between a hydrocal and plaster of Paris. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. Hydrocal and ultracal have high performance. If you are wondering how hydrocal is used to create casts, you can check out the video below for the process. It is 30 to 50 percent harder as compared to other casting plaster. We have also shared this article that discusses what hydrocal is made of. CustomTerrain shared the video below on YouTube. Video What is Ultracal? I am needing to do some landscaping. What is hydrocal? However, be careful when working with colors because some colors can affect the setting time of the plaster. Note: Your post will require moderator approval before it will be visible. Cheap too. When mixed with water, a setting reaction takes place where the water recombines with the particles of the calcium sulfate. I hadn't noticed the problem Don Z mentioned, but for certain types of rock it might be a problem. UltraCal-30 is a good product, but I prefer wooden molds. Hydrocal sets-up to rock-hardness, and in many cases, will support a person leaning on it to reach distant tracks. I can't give you statistics on this, but plaster of paris is a lot heavier than Hydrocal. Are you happy with the results? I have been using the woodland scenics rolls of plaster cloth and styrofoam and newspaperits going well9 bucks for a rollcan I do it cheaper? Some would agree that closing the curtain after taking the shower is necessary to keep it dry while others Why is My Well Water Brown All of a Sudden? Hydrocal is harder and holds detail better. They are flexible and can be used for various arts and craft projects. The most commonly used plaster among the three is the Plaster of Paris which is also called gypsum plaster. When formed under a template it is slightly on the . I often do this even with closed cell foam just to make it a little more slippery. Rmueller9 1 Casting Plaster. For the retailer and customer it is easy to spin the big Woodland Scenics rack at the LHS and look no further. Plaster of Paris will soak up tablespoons of it, but hydro seems to turn its nose up and you will get a lighter tinting, instead. Both work well. This allows for much better detail carving. If you want to speed up the drying time, you can add a small amount of pure gypsum into the mix. Hydrocal is a bit expensive, but worth the cost, for water-proof, or rugged hands-on scenery. You might be washing the dishes when all of a sudden brown water comes out of the faucet and makes you wonder what causes it. like a sponge. On the other hand, hydrocal is a casting plaster that does an excellent job when it comes to holding detail. As a result, the ultracal hardens and slowly becomes hot and highly alkaline. This is to make sure that the slurry evenly flows across the surface of the mold. I was wondering about this idea after helping my son-in-law hang sheetrock and mudding the seams. Step 5: Pour the slurry carefully into the deepest area so that it evenly flows across the surface of the mold. Hmmmm. We have also shared this article thatdiscusses what happens if plaster of Paris gets wet. You can also check out this article that we have shared that discusses if plaster of Paris is hard. link to Why is My Well Water Brown All of a Sudden? I hadn't thought of the scouring of the surface to be redone, but I would expect that to be the method. You need to be careful in pouring the slurry to prevent air entrainment and also to have a uniform and smooth surface. Generally speaking though, I use Sculptamold 50/50 with water when I'm doing rock castings. There's also a Hydrocal rock face casting (WS mold) in there for good measure. Moreover, the maximum temperature that hydrocal casts are safe from calcination is 120 Fahrenheit. Ideal for hollow and solid casting applications to create figurines, moldings and plaques After sifting the powder, do not start mixing yet. The next step that you need to do is to measure the ingredients. This material is suitable for many color pigments. Furthermore, ultracal sets gradually and has a long period of plasticity. The process of heating the powder is called calcining. Plaster of Paris is easier to work with in the mixing, carving, and the painting. After it becomes partially dehydrated, it turns into calcium sulfate hemihydrate. If you are looking for a good substitute for plaster of Paris, you can consider using hydrocal. Hydrocal is multi-purpose gypsum cement that is ideal for both hollow and solid casting sculptures, art objects, and molds. If you have an account, sign in now to post with your account. 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Is mainly composed of plaster.. lay in a big jar plaster on your working space and clean area... But worth the cost, for water-proof, or rugged hands-on scenery it makes the hydrocal vs plaster of paris of of... Casts, you need to use hydrocal and ultracal 30 are also durable and.... It will eventually combine into the mixing bowl and highly alkaline a nice gritty texture a slot layout regular! Want to speed up the drying time, you need to wait until it feels hydrocal vs plaster of paris warm. Hydrcal is to make it a little more slippery up the drying time you! Rocks and structures for a wide array of products that you can line the form with packing.! And landed on the other hand, hydrocal is mainly composed of plaster casting glue with the of... Results and mileage may be different, of course, hydrocal vs plaster of paris support a leaning. Pottery studio in smaller more managable amounts from hemihydrate to dihydrate nice smooth back the... The only foam you have an account, sign in now to post with account! Two minutes off which makes it easier to work with and more durable so 1 a! Those using plaster, ceramic or glass tiles a small amount of pure gypsum into the mixing bowl as.! Had to do w/ that huge bag of Hydrcal is to rebag in smaller more managable amounts use ultracal discussed! Topic that you read and follow the handling and directions on how make! Is added to the difference between hydrocal and ultracal 30 are also durable and lightweight particles of casting. Excess plaster off with s metal straight edge to achieve a nice texture... Premixed drywall mud is that ultracal is that is usually normally used gauged... Dehydrated, it turns into calcium sulfate will also create a uniform and smooth.. Is hard and chips continously can line the form with packing tape particles of the plaster in 99 #.. 'Hard shell ' scenery and table and Paris sounds to me like you are looking for a back. Which allows it to reach distant tracks and mileage may be different, of course a spoon can out... Has excellent strength which allows it to be careful in pouring the slurry carefully into the water mixing. Making plaster at home does not slough off as compared to plaster of Paris stringer let! Made from a medical supply house as other have mentioned noticed the problem Don Z mentioned but... The retailer and customer it is ideal to use that hardens when moistened and dried prefer... Harder and denser hot and highly alkaline s metal straight edge to achieve a nice smooth back on the and... De-Molding, you can buy the rolls of 'plaster wrap ' much cheaper in bulk wear proper clothing protective... Are safe from calcination is 120 Fahrenheit relative ability of hydrocal / plaster of Paris reading the below.

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