Moldmaking Tutorial: 2 Piece Hydrocal Plaster Mold For Silicone Casting 

Sure you don't. We're all here just checking this out...for a friend.

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Ultracal 30 is harder and slightly stronger, but it is also heavier and doesn't have the same working properties as hydrocal. Both would work for this process, but I prefer Hydrocal for its ease of use in this type of mold. I also like the lighter mold in the casting process.

Ultracal is stronger and has a longer working time; UC 30, 90 and etc. speaks to the varied types. It's wise to include an acrylic bonder in the mix for either stones, as that can extend the life and durability of the mold. Also, Untracal is an accurate gypsum, in that its distortion is minimal, while Hydrocal expands between 7 and 12%, making it difficult to add layers or make prosthetic molds with. Hydrocal is great for making life casts, because the expansion helps to mitigate the shrinkage that occurs when you make foam latex prosthetics or props. The current silicone, gelatins or urethane casting materials are usually more accurate and so, expanded hydrocal molds aren't as necessary.

Prosthetic molds are best made with a rigid material, such as Hydrocal, Ultracal 30, or tooling resin. The exception, of course, are flat molds. Those are best cast in Gel-25 or 73-15.

Brick In The Yard Mold Supply oh really? I didn't know that thank you! I thought hydrocal would be more skeptical to breaking compared to silicone moulds?

As in breaking/cracking in the smaller details, not the actual mould.

It just depends on the way the mold is being used as to what the best option is. Each material has its pros and cons.

Most hardware stores will have a paste wax like Minwax that will work.

Metal shims are good for some applications. I chose clay for this on as it is easier to key and follow an irregular parting line.

Hydrocal is a very hard plaster, a gypsum cement.

at my house, I just pour the sludge out on my yard and it returns to its rightful place in the earth.

Can't take credit for that. The model did open her mouth slightly for the cast. We used Platsil Gel-25 for the lifecast. Although it doesn't taste like bubble gum, it isn't bad to have in your mouth.

That is amazing. I would expect the gel to influence the shape of a relaxed lip. Pretty amazing result indeed. And good to know. Whats next? Open eye casting?

Not if you are careful. Monster Clay is fairly firm so you won't deform it unless you put unnecessary pressure on it.

well?

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Fabienne Ten Brinke 3?