Colored epoxies Moisture Cure urethane. Sprayed with no thinner through HVLP spray gun works great. I’m sure it would work fantastic dipped or brushed as well.
Used it as a dipping sealer as well, for pine, maple, AYC, WRC, no issues. Just a bit viscous and may have a few runs, could probably thin it up to 50% with xylene/xylol.
Tommy