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Well the urethane is tacky again. I suspect I either didn't use enough mineral spirits to get rid of the oils, or I didn't let it dry enough between the mineral spirits and sanding sealer. Guess I'll...

I tried sanding off the urethane, but it just turned into gunk. I used an Xacto knife to scrape most of it off (managed to slice into the wood in a couple places) then an acetone wipe to get the rest...

Would it do better with epoxy, and should I sand off the urethane before putting the epoxy on?

I coated a set of Bloodwood and a set of Bolivian Rosewood scales with Minwax Helmsman spar urethane (spray) a couple days ago. They were outside in the cold most of the time, but I brought them...