I don't understand this, because primer is not a moisture barrier. Park a
primered car outdoors for a week and see what I mean...
on 7/18/03 10:26 AM, David Breneman at idcb@airborne.com wrote:
> Blair J. Weiss SEZ -
>
>> Bondo goes over bare metal, seam sealer goes over primer.
>
> The fellow doing the body work on my MGA tells me emphatically
> that you always apply body filler (don't know if it's Bondo
> brand he's using) over primer, then apply more primer over the
> filler. This is to prevent moisture from getting between the
> filler and the metal (since the filler is hygroscopic), causing
> rust and separation of the filler from the metal. This
> condition usually shows itself as little "pimples" under the
> paint which, if impacted, will cause a chunk of the filler
> underneath to break free from the body and leave a big hole in
> the paint.
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
(uh, always parked outdoors... hmm)
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