I am working on an acrylic-painted game board and am starting to put polyurethane on it to get a high gloss finish. But being that it is a game board, I think it needs to be put on one layer at a time so as to avoid any kind of marks from setting wet poly on a stand, which leads to my question: what is the proper method of putting polyurethane on the board one side at a time? Would I be better off completely finishing the top, and then start on the bottom? Or should I do the top, let it dry, then the bottom, for each coat?
Wood – How to put polyurethane on wood, one side at a time
polyurethanewoodwoodworking
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Best Answer
Top, then bottom, then top, then bottom will greatly reduce the odds of the board warping due to differential moisture uptake/release when one surface is sealed and the other is open to the air. While the acrylic paint is sealing it somewhat, the conventional wisdom of long experience is to try and keep the number of coats per side the same to prevent (or at least reduce) warpage.