Knowing I would be wet sanding this primer coat, I didn't bother to protect the finish when painting a customer's propellor. He wanted red tips, so a lovely coat of red overspray blessed my white primer. Well, try wet sanding red and it looks like a murder scene! LOL. My objective today was to "contour" wet sand in order to find every single last imperfection that needs to be filled. I will run over every spot with Z-grip before laying down the final coat of white primer. I can't wait to see this bird on it's feet again.