Next weekend I'm going to cover my junk with epoxy primer(vp2050). I know this is a debated issue but, what is the general consensus among the experts here about acid washing the shell before epoxy? I will have a fresh 80 grit surface for the primer to adhere to.

Good idea or waste of time?

Thanks,
Josh

 

Don't crowdsource the answer. Every auto paint manufacturer publishes extensive technical data sheets for the proper use of their products. I'd use that info, not the interwebs. I like to use House of Kolor products. They call for a 320 grit finish followed by wipedown (naturally using their cleaner products). Acid etch is so last century. Read the data sheet for the product you are using.

 

 

Yes, I have and have read the data sheet. The car has been bare metal for quite some time, I am going to da the surface this weekend and was just wondering if an acid wash would be a good idea or not. I'm NOT looking for adhesion promotion, just protection until I primer it.

Thanks..


Edit: I can see how the first post is not exactly clear. I sent that while at work and didn't really complete the post.

 

Thanks Hairy Olds

 

^^^this!!!^^^

 

I've always used the PPG phosphoric acid etch on steel (used to be an Amchem product). I can't think of a downside in attempting to make the surface as contaminent and oxidation free as possible. Followed with their phosphate solution which I understand to be pretty standard pre-paint treatment to promote adhession. The thin and likely spotty phosphate treatment doesn't afford much corrosion resistance so you really should paint it shortly after treatment. PPG has similar products for preparing aluminum including a clear and yellow post-etch material. Joe you've likely seen a stronger version, the yellow chromate specified for military brackets and chassis.

 

Thanks for the replies guys, much appreciated. I think I'm just going to give it a quick da with 80 grit and a thorough wipedown before I lay on the primer this weekend.