There is another video with that one- the guy is doing a forestock, grip, and a butt for what looks like a MP-5. The video shows him applying clear over it. Seems like that would seal it from water.
Sure could make everyone look- how about wood grain rocker covers? Or even better, dip the block? A wood grain block in something like an old school street rod where you could really see the sides would be a hoot at a car show. "HEY- that guy has a wooden engine in that car".