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Mike -
The best way to phosphatize metal is to completely saturate the surface
with the liquid and letting the excess run off, then let it air dry or
force dry with some hot air fans.
Do not sand after because you will just remove the beneficial rust
inhibitive phosphate coating. You can wipe gently with tack rags prior
to priming.
-
Tom Poterack
'49 Chevy 3600
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Message-ID: <bf.259644c.262b6e95@aol.com>
Date: Sun, 16 Apr 2000 15:29:25 EDT
Subject: Re: [oletrucks] Paint Primer
To: Tom3600@webtv.net, little-castle-contracting@cadvision.com
CC: dkrehbiel@kscable.com, oletrucks@autox.team.net
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In a message dated 4/16/00 12:25:50 PM Pacific Daylight Time,
Tom3600@webtv.net writes:
>
> I know a little bit about paint and primers having been in the paint
> business for over 40 yrs. For 10 of those years I was in the R&D lab
> developing corrosion resistant primers for John Deere and Caterpillar
> Tractor.
> The no. 1 thing to consider before any primer is METAL PREPARATION! The
> surface must be rust free, oil free, dirt free, etc. You must put some
> kind of phosphate on the metal whether it be iron or zinc. There are
> lots of products available for this just ask your local paint dealer or
> bodyshop what product they recommend. The reason you need this is that
> it will give you rust prevention and promote adhesion of the primer.
> Actually some slight flash rusting is good and will be present on the
> surface after the phosphatizing procedure. Todays primers do not
> contain lead or zinc anymore for several obvious reasons. This means
> that the primers available today are strictly to fill in the surface of
> the metal and give you adhesion of the topcoat and do not prevent
> corrosion any more than the topcoat.
> Consider this your Primer primer. Do not hesitate to contact me with
> any of your metal finishing questions.
>
> -
> Tom Poterack
> '49 Chevy 3600
HI Tom,
I've always wondered something about the phosphating process.....after
applying it, then letting it "cure", what type of prep do you recommend? i/e
just wet rag wipe and air dry, or resanding?
Thanks,
Mike
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