Try Zero-Ruse Prep-Step
(http://www.zerorust.com/prepstep.html). This is a
phosphate-based powder that you mix with water and
spray on bare steel. It leaves a slightly dull gray
surface on the steel that will keep it from rusting
for s couple of weeks. The nice thing is that it is
not acidic or nasty, and you don't have to rinse it
off.
I got it from a vendor at a swap meet, and it has
saved my a$$ on my '31 Ford project, when I
sandblasted the frame and floorpans over a period of
several weeks.
Someone once recommended Dupli-Color self-etching
primer in a spray can for the situation you described.
I got some and used it on some chassis hardware, but
I found that the paint I put on afterwards tended to
chip off easily. Most "primers" are lacquer-based and
have a lot of filler (talc), and are porous and not
very strong. A bad choice for your chassis!
You might try Eastwood chassis black primer, which is
a 1-part epoxy-based primer.
I really recommend a 2-part epoxy primer like PPG
DPLF. It dries very hard and strong and waterproof.
But you have to mix it up and spray it with a gun, and
you need to put on the next coat within a few days
before it fully cures. So it would not be very useful
in your situation.
Doug Braun
'72 Spit
--- David Mayer <celiracer81@hotmail.com> wrote:
> What are everyone's thougths on rattle-can primer on
> bare metal of a Spit
> while it is waiting for body work and final
> painting? I just keep getting
> rust spots on the bare metal that I have already
> blasted and sanded a couple
> of times. The humidity is killing me here.
>
> Any recommendations for something that will seal up
> the metal well and keep
> that from happening?
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