Thanks Tim. If I can get the poly to spray anywhere near as nicely as the stain, I will be very happy. I got the gun dialed in exactly where I wanted it on the stain and it was great to work with.
I agree that the crosslinker isn't really needed. In theory, the trim and soffits shouldn't every get touched. Except for the occasional popcorn fight, I don't see things getting too out of control in the theater .