In that case Jim it would be considered a wet-on-wet sealer, not a primer.
Some products will fill either role depending on mix ratio and dry time, or
lack of.
James Thursby
-----Original Message-----
Behalf Of James H. Nelson
Subject: Re: Primer and Paint
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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