Primer Problem. Please Help!!!

[84C10EC]

I am restoring a set of Boss 338 wheels and have stripped and primed them with 3 coats of self etching primer. I am currently in the process if wet sanding the primer with 400 grit paper to prepare for the top coat. 400 grit was recommend by the manufacture of the primer. As I have been wet sanding some of the primer has been sanding off exposing some of the aluminum. Its been minimal and mainly just at sharp edges. Do I need to apply another few layers of primer? If so should I continue with self etching or should I use something else? Appreciate any help and advice. Thank you.

[StingRay]

Most etching primers are not sanding primers and are very thin. Generally they are not for multiple coats either. Typically they are a thin coat put down for a primer surfacer to be applied over. Regardless on aluminum you want full coverage of a good etching primer prior to topcoat so it will need reapplication at least before top coating. Not knowing what specific material you are using it's tough to give good advise. Your material tech sheets are your best friend.

[72HuggerK20]

Your best bet would be to use a thinned down epoxy primer as a sealer just before painting. Epoxy primer is good DTM and over just about anything else too.

[projectking]

Originally Posted by 72HuggerK20

Your best bet would be to use a thinned down epoxy primer as a sealer just before painting. Epoxy primer is good DTM and over just about anything else too.

IF he removed the etch primer. Epoxy and etch don’t mix.

[MARTINSR]

It really depends on the manufactures guidelines.

READ THE TECH SHEET! What brand is the etch primer?

A few sand throughs here and there isn't a big deal, but what does the tech sheet say?

Brian