I'm going to be making my son a birthday cake tomorrow that requires a stone texture on the fondant. It is going to be a 10" round with an edible image on top. My question is two fold actually. Do I use my texture mat to emboss on the stone before or after applying the fondant? I feel like it would be easier to do it before I put it on the cake, but I havent used tried this technique before. Do I need a smooth surface on top for the image to turn out correct? Its not the rice paper type of image....It seems rather sturdy. I wasnt sure if the stone pattern would make it look too bumpy.