MY FIST EXPERIMENT PAINT/SCULPTURE WHIT A MIX OF RIVER SAND AND GLUE FLOOR TILES. I checked a lot of glues, and I discover that " ADESILEX from MAPEI " is the best and the stronger. More strong then the rock. And it absolutly doesent detach from the board. Then, after the dry, I paint it whit acrylik color in successives liers.