xxxx89gtstangxxxx

I have never painted a car before and Im painting my 89 Mustang. I have new fiberglass fenders that I bought and I need to know what grit sandpaper I need to sand them to prepare them for the primer. Anyone that can help please reply!

Boss_Hotrod

Ive never messed with fiberglass but in my Streetrod class I was taught to use (including bondo work) 40, 80, 180, 320, 400, 600. in those stages from bare metal and bondo to finish primer. We primered after the 180. Then wetsanded with the higher grits. There are a couple of body guys here that may have worked with fiberglass and can help you better with that aspect.

crueheadstang87

sand it with 400 grit. any thing coarser than that and you might have to reprime them.. iam a painter at the local ford dealership!!!

stang8689

I use 320 for everything but I always prime it then go back with 400.

5.0stanger

I blocked everything with 180, it will cut faster and make a straighter panel. Then I hit it with the DA with a transition pad with400 to get it ready for primmer. I blocked my primmer with 240 and 320 and then I will hit that with 600 just before I seal it for paint....but I am just a noob being told what to do.