Stripped, sanded and primed the avionics access door for the third time. This time, I sanded the door with a palm sander and 150-grit paper, then finished it off with Scotchbrite pads and fine-grit paper before priming it with SEM High-Build Primer. I FINALLY got all the little visible nicks out of the door. In the next week or so, I'll paint it for what I hope will be the last time. Yeesh. Nothing like turning a half-hour project into a weeklong odyssey...