i'm sanding down my 2000 z28. how do i know when i've hit the fiberglass? is it necessary to do so? the paint right now looks godawful, and i don't know what's underneath. i'm sanding with 80 grit. i plan on having someone else paint it. can they primer over that, or will it need to be sanded finer? also, what do i do for the bare metal in the interm? can i just spray some sandable primer?

 

After u get all the old paint removed, you are goin to want to high build primer the hood anyways, so if u go threw its not a big deal, and u want to atleast finish it off with some 150 grit 220 would be nicer

 

Considering they are plastic and fiberglass I wouldn't use 80 grit, go too far your going to lose alot of material. Fiberglass would be white when you got to it.

 

I dont know where you think your gonna find fiber glass on a z28...

 

door panels ,although technically they are fiber-reinforced-plastic, which uses a slightly different resin then traditional polyester based fiberglass.

everything else is either plastic or metal.

 

true indeed

 

isn't the part behind the t-tops fiberglass or is it plastic. Because when I flipped my camaro and I had to take that peice off and it made me all itchy.

 

the doors are made of Sheet Molded Compound (SMC) that has fibers embedded in it, but are not fiberglass...

Heres my door, cracked it a few months back and havn't gotten the new door on yet..

 

the decklid, and the sissy bar are glass...

 

you should not be using 80 grit on anything that you're going to repaint unless you plan on doing some major major high filling. 220 is the most i would use, especially on plastic and fiberglass.