I am repainting some panels on my Vette. What should I scuff the paint with wet sand with 600 or 800.

I, myself use 600 grit wet for base clear, and a gray scratch pad or 1000 grit wet for blend areas.

I am going to scuff the whole panel, and it is bc/cc. So 600 is good.

Yeah, the bases I've used call for 400 grit, but I like to go a little better and don't have a problem with swelling or anything. You can go 800 wet if you like, little more sanding.

We sand all BC/CC with 800 wet especially if its a silver, the metallics will stand up if you use too course of a paper, also check to see if you are using P paper which has a yellow back which is a truer grit paper or A type paper which is more aggressive and that has a black back.

It depends on what you are doing.

If you are putting a 2K primer/surfacer over the old paint, PPG recommends sanding the old finish with 180-240 grit. If you are just gonna squirt some new paint over the old, 400 or 600 wet will do the trick. I would suggest using the 2K primer surfacer. It's rare that an old finish is straight enough to paint without it.

Tom

Good points Thomas, the lighter metallics and pearls are a lot more prone to problems. I know of a painter who refuses to paint silver, I'd fire his a**.

on areas where you will shoot base coat color 400 grit for all but fine metallics, fine metallics 600 grit. areas where you are just going to shoot the panel with clear = 600 grit. blend areas 800 - 1500. p-paper only

Thanks guys