Teardrops n Tiny Travel Trailers

We bought a spray gun to paint some doors this weekend. It worked very well on the doors, it really was a labor saver and now I'm wondering if I can spray the interior of the tear with spar urethane. It shot latex just fine. Anybody spray spar urethane?
Bruce

You may want to experiment a bit, I find that when spraying polyurethane that if you add a little thinner, it will spray better, lay a little better and set up a little faster. As always YMMV
madjack