I was wondering can you stamp plaster. I have seen people stamp concreate and wondered can I make decent rock face the same way. I have a shallow mold I made from a real rock that I could use but I don't know if it will work. If I can it will mean a lot less plaster and alot less time spent. I have a 3 foot by 8 foot area (3x4 but two sides). If so what type of plaster sould I use? normal plaster of paris, hydrocal, drywall mud even. Should I mix dry then stamp or mix normal wait then stamp? Any Ideas? Maybey its just a bad idea.