I recently put a second floor in my garage to create an office. I used pallet racking (fits perfectly and gets maximum head height) and 50mm chipboard Mezzanine flooring for the floor. I stack logs for winter in the lower part of this building. These will often sweat and residual moisture can accumulate on the underside of the mezzanine floor which wont be good for the chipboard. Whats the easiest and quickest thing to seal this with before i stack next years logs? I need to do it but dont want to spend hours doing it. I wondered about bitumen but is that overkill and will a diluted brush over with something like PVA do the job?