I did a search already, but I can't find specific answers. I just finished painting my side skirts a few days ago. I sanded them down with 320 grit sandpaper before I started, but there were some cracks and deep scratches that I couldn't get out. I assumed the primer would cover it, but it didn't. I used regular sandable primer by duplicolor. Would filler primer have done the trick or should I have just covered the scratches and cracks with something else? The scratches are on the bottom, so I didn't sweat it. I let the primer dry for a day and then I sanded with 400 grit paper and then 600 grit. I layed on several coats of color after that. A little dust blew onto the paint as it was drying. Can I wet sand the color coat before I lay down the clear coat?