Just like the name says, it's a concealer for the craze lines that develop in the painted surface of composition and some wood dolls. It is very easy to use. Just take a small amount straight from the jar, rub it into the craze lines for a few seconds and then wipe the excess completely off the surface. The craze lines just seem to disappear right before your eyes. 'Compo Craze Concealer' contains no harsh chemicals and no paint so it will not harm the original finish of your doll.