Durham's Water Putty is a powder that you mix with water! You can fill cracks, knot & nail holes & screw holes. It sticks & stays put. Will not shrink. You can saw, sand, polish, color & mold it. Because of its hardness, Durham's will not take surface stain. Color before using with dry pigment, water-based stain or water-based paint.To view and download the MSDS for this product, click here!