Rich, when using Hydrocal to make molds, are there any special requirements for mold release agents different than using epoxy to mold?
Assume I'd be using Partall and PVA sprayed on... are these ok to use with hydrocal?
Well the way I did it was like in the DVD I mentioned. I used blue foam for the plug painted with water based polyurethane, no parting agent. PVA is water soluble it won't work with Hydrocal. I actually used Ultracal 30.
Other than being somewhat weaker, any difference in how the molds turn out if you use regular plaster?
The Ultracal 30 is much harder than plaster, so hard my molds actually rang like a bell.
If your going to do this invest in the DVD, it will save you time and money.