System 3 makes a uv stabilized epoxy clear coat (207) used on brightwork on boats. But my point was simply to not expect doug fir ply to not check unless you put a lot of work in it. The paper on the MDO seems to hold the grains together as I have a tansom on a jet boat that I did 6 years ago and simply painted with acrylic house paint, it lives out side and doesn't have a single check. Just puttin' out options, that's all.
for reference here is a link i've been following on the subject: Epoxy test panel after six month
I'm hoping to build a wood drift boat or jet boat in the years to come and have spent a fair amount of time researching this. Also Cajune boats in livingston uses System 3 - 207 for their production boats.