Also, I don't want to use a good gun for POR15.
A cheapo HF gun would be the way to go. You wouldn't have much to loose if it hardened up in the gun.
But your concern about overspray is definitely valid.
Doug, that frame looks pretty nice. Interesting hoist arrangement, too.

I see that you've been bitten by the caption carryover issue. All your photos have the same caption from one of your previous photos. You can fix that by entering a single space as a caption on your next photo which will carry over as a blank caption on your subsequent photos, or be sure that you put a caption on every photo.