1971 GMC lwb to 1968 chev swb project

[TchncnDen]

Originally Posted by chevy88

Attachment 1040097This is a picture of second coat all sanded down but and lower panel needs still needs more sanding. So if so do I still need third coat of bondo on any low spots or should I start using putty for rest, as far as I have read putty is just for scratches and air pockets?

When you get that close what you need to do is cover the entire area again with bondo top to bottom, front to back, then you can block it down so it is perfect. I know this may not seem necessary, but if you fill the small low spot while you are sanding it you are also sanding around it, all you do is move your low spots around. Always finish with a skim coat over everything. It is ok to use polyester putty with hardener for this, but if you're talking about the acrylic putty that comes in a tube like toothpaste just throw it away and forget you ever bought it.