I have used this particular mold the most in my layout. It is easy to make and adds a nice touch. Takes about 6 ounces of dry powder to about 3 ounces of water. Put the water in a disposable bowl and then add the powder while stirring. Lightly wet the mold first, don't over stir and don't wait longer than 5 minutes to pour the mold. Molds are very easy to clean up. After removing the rock mold. flex and twist the mold to remove residual material. Then use some water or Windex to finish the cleaning. Don't get any plaster down your kitchen sink or commode or you could be calling the plumber. Have fun, that's what modeling is all about.