Blasting, welding, priming suggestions

[snakeoil24]

Chrysler hot dipped the bodies and galvanized them. I was always taught to use Zinc rich primer then regular 2K, followed by body work. then more 2k then sealer.

 

[Donny]

I tried that a few years ago, the 2K required too much sanding, I'm only interested in covering the bare metal, and providing the best primer reduced to serve as a sealer; epoxy primer...then, get it out of here. But...I'd prefer to send 'em out of here in bare metal, and have the customer worry about painting it their way and in their place. But, you know how this goes...

 

[66_B_Body4ever]

Etch primer is nice but not compatible for a long period with Epoxy. Look at the web sites for all the Paint MFG they tell you that.

Hmm, can't find what your referring to. Can you post a link?

 

[moparmuscle]

Ok ...so after sandblasting etch prime the metal..do the metal work/welding ect with weld thru primer... then seam sealer before or after the epoxy?

 

[KnoGood]

After welding in frame connectors, I plan to blast the undercarriage with 30-60 glass, clean with wax & grease remover and immediately apply epoxy (basf 801-703 chromated). the top coat will be applied within a week. Next will be the trunk, interior, engine bay, trunk lid, hood doors fenders ....Hopefully the by the time I get to the exterior body surfaces I'll know what I'm doing !

 

[snakeoil24]

I've never heard of etch not being compatible with epoxy, humm, I'm interested in validating this claim! How I use etch, of course on bare metal after being media blasted, the etch primer dries to a consistency of sandpaper, which I sand down, and, you can see the penetration of the etch green primer into the metal, this is crucial as this deposits the chemicals that hinder rust growth-I want to say rich in Zinc, but, I'm not sure. I do know that it works -- works well I might ad.

You are using the Zinc phosphate Etch which i think is whee im using wrong name. You have great results, I use phosphoric acid with zinc added. so we are on same page.....