When I did my '69 El Camino, I just used normal primer (Nason, I believe) over bare metal.. Since then, I've seen ads proclaiming how you should use an etching primer on bare metal, or an epoxy primer, or POR-15, or what have you.

So... once I take parts of this Camaro down to bare metal, what is the BEST (I know, it's all subjective) type of primer to use on bare metal?

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camaro@derekf.com
67 Camaro Basket Case
69 El Camino SS396 (Daily Driver)

Primer for the most part does not have corrosion fighting capabilities, that is why they say to use a zinc etch on bare steel. But PPG does make a primer that has some anti corrosion properties in it. If you must prime over bare steel, Id use DuPonts URO prime or PPGs K-200 or that primer that I just mentioned.

For as much money that people spend be it either farming out the work or doing it them selves, its just easier to put that etch that is needed on bare steel than it is not to. Why jump over a $50. to pick up a $5.?

If your doing the work, put it on. If not, insist that it is used.

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67 Camaro SS Conv.
70 Challenger R/T Conv.

PPG's corrosion resistant primer is D822 in the Global line used with D823 and 871 reducer 3-1-1. Although it is a corrosion resistant primer I still use a metal etch over any bare metal. Like ragtopman said it CHEAP security. What little money you save would never be worth the problems that might occure. K 200 seems OK but I've seen shrinking in the past (high build).
Austin

The K200 and UROPrime are Urethanes and really not corrosive resistant. PPGs 171 (I forget the letter code in front of the number) or DuPonts Vari-Prime or Martin-Senours Trio-Prime contain acid and that is what really helps adhesion and corrosion resistance. Urethane primers really don't stick that well, if you put one of these "pretreatment" primers on you will see a big improvment in how the primer holds on. When you sand though it and hit metal, you won't see that sharp breaking edge like it has lost adhesion, it will just feather off nicely.

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Fan of anything that is interesting and moves human beings.
1965 Buick Gran Sport Convertible
1965 Buick Skylark H/T
1948 Chevy PU with 401 Buick

D1791/D1792