I'm going to float the barrel on my rifle. Rem 700 .30-06 w/ factory wood stock. Can anyone recommend what to use to seal it back up after I sand down the areas where it is contacting the barrel? I've done lots of wood working, but never messed with a gun stock. I was just planning on using a good polyurethane, like from min-wax. Does it require anything special, since it's not even visible?