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Posted for "John W. Cox" <johnwcox@pacificnw.com>:
Jon, understand that primer which is porous by design, will be exposed
to hydrocarbons and organics in flight. After the fly-off period you
are considering, be sure there is enough mil thickness of remaining
pre-flight primer to be cleaned with an appropriate cleaner and then
thoroughly sanded again for reapplication of final primer-sealer and a
successful topcoat.
I have experienced adhesion difficulties with using either 400 or 600
grit on primer (for exactly these reasons) in the past. That said, if
you sanded with either for the fly-off period and left enough thickness
behind... you should be able to sand it down and reapply the correct
primer for the topcoat chemistry that you select.
John Cox
PS - I leave the final coat to Tom Connors of Bend, OR if quality and
appearance are the desired conclusion.
> Looking for comments on the pros or cons of sanding the last coat of
primer. I intend to fly in primer for a few months and have mixed feelings
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