As Olaf replied epoxy resin works well. Also fiberglass resin (polyester) works as well and is cheaper. Mix with the hardener as instructed & Thin with acetone until it drips off of a stirring stick. Add your roughed out piece and a quanity?? of the resin mix together into a VINYL bag. Play shake and bake every time you walk by and leave overnite. In the AM it will be hard and the fibers hard and the pores will be open like new wood. There is no discoloration of the wood and it cuts and finishes like new wood. Works every time.