Bob,
You're right that primer is, indeed, porous, and it'll weep rust
after 6 months in Seattle's rain. However, few (if any) primers, DP40
especially, have any UV protection, and oxidize after a few weeks (or
months) in the California sun.
Mick,
I've never had any problem with primer absorbing enough water to
cause problems. But I seldom paint the same day I wetsand. But I have
had hellacious problems with it absorbing solvents, then solvent-popping
when it's baked.
After a friend showed me the benefits of dry-sanding primer, (it goes so
much FASTER) I've stopped using water until after the top coat's on...
My 2c
Toby
> Mick,
> Primer should be covered up with paint soon after it is applied. If you use a
> good DP-40 type primer with catalyst, these are supposed to be rust inhibitors
> and are supposed to be able to be left out in the weather. Not that you would
> normally want to. Regular primer isn't like this and should be covered by
> paint.
> Bob
>
> He recommends *not* wet sanding primer,despite the
> fact that it's popular with body men, that it absorbs moisture [as does
> Bondo] and tries to find its way out later in the form of blisters.
>
> Any learned opinions on the wet-sanding of primer?
>
> Marc T.
>
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