Fred,
PPG said that you put on the primer and wait about 15 to 20 min
and then put on the top coat. Not let it dry at all.
Jim
N15JN
<fillinger@ameritech.net> writes:
> "James H. Nelson" wrote:
> >
> > Fred,
> > I talked to the smooth prime people and that is what they
> told me
> > about primer and top coat application. Even when using their top
> coat,
> > they wanted me to put on the epoxy primer first and then a top
> coat.
> > Believe me, I was getting tired of sanding and wanted to get it
> finished.
> > Yes, the wet-on-wet will increase the coating thickness and
> > subsequential weight. How long it will last----?? don't know.
> >
> >
> > Jim Nelson
>
> Thanx for clarifying that, but I thought PolyFiber's only epoxy
> primer
> now IS UV Smooth Prime. The main purpose of the Smooth Prime is as
> a
> UV barrier. A top coat can go directly over fiberglass, but that
> usually won't work too well, but the UV issue renders it moot.
> Whether or not a solvent type primer on top of Smooth Prime will
> improve solvent topcoat adhesion I'd think has to be a guess. I
> found
> a white paper on "tooth adhesion," an rather oversimplified term.
> Even sandpaper grit size matters, but is coating dependent.
>
> Re "wet-on-wet," the topcoat mfr's directions should control.
> Normally it's a no-no, but if they didn't say OK, any problem would
> have been quickly evident. They usually specify a wide window
> wherein
> dry-to-touch primer need not be sanded, but after that some say you
> can use SkotchBrite pads, or -- get this -- Kraft paper (brown
> mailing
> package paper)!
>
> Best,
> Fred F.
> The Europa Forum is supported by Aviators Network UK
> <info@avnet.co.uk>
>
>
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