hydrocal vs ultracal 30
Hi!
I always preferred using ultracal 30- it's a gypsum cement instead of a plaster, so it has a better library life, in my opinion- but the previous poster is right, either will work- you could even make your mold out of molding plaster, it just won't last as long. The reinforcing tip is a good one- I use fiberglas rovings instead of burlap, as they tend to lay a little flatter and not soak up as much water out of the plaster as the burlap. Be sure to let your mold cool down (as with sculpey) before taking it out of the oven so as to avoid cracks. Also, most suppliers of foam latex sell a paste separator that really helps- you just brush it in zinc oxide, I think?
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