I primed the first parts with the spray gun today. This primer is great to spray with my new gravity feed HVLP gun. I don't know why I even attempted rolling it on. First a light coat, let that set for about 15-20 minutes, then another coat. This is all that's needed. Perfect results so far, I hope the topcoat goes on as easily but I guess not. I also did some more work on my aileron tip fix, sanded down the fibreglass reinforced filler and added a light coat of normal filler for a smooth finish.