I do large art pieces using a gypsum based plaster on plywood or masonite. I need to find a material that is stronger, and less likely to chip. I use a trowel to apply my material to a thickness ot 1/2 to 3/4 inch. I am wondering if fresco plaster would give me the strenght I am looking for while not sacrificing the flow, flexibility and surface smoothness of the material I am currently using. Strenght, weight, durability and vicosity (peanut butter-like) are all concerns. Anyone have any suggestions?