i think ive finally came up with a recipe for frosting soap. i used fbb, mp soap, meringue powder and cornstarch. made a small batch last night, it still looks great so far, you can touch it, it holds its shape, it does feel like a hard marshmallow, i broke one open this morning, its spongey, but it doesnt crumble or fall apart, it lathers, i didnt put any fo or color into yet just yet. Im hoping they dry more and the meringue powder makes them a bit harder, we will see. I frosted one bath bomb cupcake with it, i'll post a pic in the gallery.