The Stovebolt Site Forums The Shop Area Making a Stovebolt Bed What did you use on your bed

..... SPAR is the magic word here. That is the ingredient that will let the finish expand/contract without breaking or cracking, which is what lets moisture in and ...well, you know the rest.
Perhaps I should have said Helmsman SPAR urethane. At that point I guess its the % of concentrations that probably makes one "More better" than the other.