I'm going to take down our Mahogany front door and put it level on horses while I sand it and put that Marine finish the recent FWW found to be the best. That's 6 coats (and that stuff wasn't cheap). Probably take me at least several days or up to a week. While the door is down I plan to put up an identical measured piece of plywood, try to cover it with plastic to keep out rain so the type of plywood shouldn't matter. But we've got rain forecast for the next days and if it gets wet that shouldn't matter for just a few days...right? Just checking.