I am pre coating the planks with epoxy prior to assembly. I am using MAS slow hardener and MAS resin. It has been two years since I coated with epoxy, and forgotten what a royal pain it is. This stuff spreads like glue (which, I suppose, it is)... anybody try cutting it slightly with acetone or some other product to get it to spread a little easier ?? It would seem that if all you are doing is 'waterpoofing' wood, that should be ok, might even get better penetration into the plywood.