I Live Here
Joined: Dec 2007
Posts: 18,157
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Is it ok to use the acid etching primer on blasted bare metal? I have never heard this, and dont understand the difference in blasted metal, or ground on metal?
Just asking to clear up my head.
Kasey
wow, Yes it's ok to use etch primer first on bare metal, it's recomended.
First off I don't see any difference between blasted and sanded ground metal. it get's treated the same imo.
I have done lots of sand/media blasting and paint work over the years(25).
As soon as I'm done blasting when I have bare white metal before I even touch it, I paint it. The first coat of paint is etching primer. 1 light coat, it's translucent and provides a chemical advantage for top coats. Then within 1 hour or so the second and third coats are epoxy primer. Then at that point within 24 hours if I can, I apply the top coat without any scuffing or sanding. Like say the bottem of your car or inside the car. Wet on wet is best for best results.
Some people will say epoxy directly on bare blasted metal but using etch primer first is better.
Once your metal is blasted bare, you want to coat it fast and definety don't touch it or pre treat with anything, as it as clean as can be after blasting.
I've done entire cars and trucks with the above procedure and still own some of the trucks that I painted 15 years ago. I know what holds up.
Got lot's of pictures of my work.
My 71 has etch primer all over it.
I agree with every word to the letter . 
It's funny when clueless people would give advice on something they have no experience with.
Etching primer is always recommended to be applied before any other primer for ultimate adhesion,after etching primer any primer system can be used,epoxy or 2k primer-surfacer or sealer.As always, read tech sheets before use. 
...with you guys, I've been painting cars, bikes, trucks, speed boats for over 30 years now,...and I basically tried every manufacturers product or "system" over the decades,...I'm generally a consumer of Dupont products, I do prefere the high end componets,....but the base is always the same, blasted or sanded metal coated immediately with Dupont Vari-Prime, 1 flash coat followed by a good med 2nd coat, allow to dry 1-2 days, followed by a Dupont 2K primer surfacer coat, then blocked, reprimed, Euro-soft putty for small defects/shallow lows,...I generally have all the metal work, with bondo to an extreme minimum done before I apply the Etch primer,....I feel that after etching/2K priming the car should be in just the blocking stage, all major bodywork done prior to etch priming,...If you choose to use the DuPont line, AVOID the Dupont/NASON crap,...pure junk....Dupont Vari-Prime, 2K primer, and a BC/CC in Chroma Premier will result in a show quality finish that will last for years
Mike
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