My experience is that when a paint such as Rustoleum crinkles it is because of
too much solvent in the last coat (that was applied). WHen using spray bombs
too thick of a coating will put too much solvents on the surface and if the
solvents do not evaporate fast enough then there is a chance that they will melt
down into previous layers of paint. In my younger days, prior to learning about
automotive epoxy primer, I used rusoleum rusty metal primer under acrylic enamel
automotive paint. The trick in avoiding the crinkle finish was to seal the
rustoleum primer from the much more agressive solvents used on automotive
finishes. I put several very light (almost dust) coatings of laquer sanding
primer on the rustoleum primer. I only did this when the air temp was over 80
deg F so that the laquer thinner would flash off before melting into the
rustoleum primer.
From: "Westerdale, Bob" <bwesterdale@edax.com>
Subject: General Rustoration, certainly lbc relevant.
In the course of restoring various lbc's, refinishing the hoodsticks,
prop-rods, spare tire wells, etc.. I have had some unexplained failures that
perhaps are not entirely my fault.
For years I have used Rustoleum enamel, largely because it seems fairly
durable and is readily available, and fairly inexpensive. Most of the time
it goes on fine, whether from aerosol or brush, even thinned and sprayed
with a gun. However, sometimes after starting with Rusty Metal primer, the
topcoats ( usually the 2nd) seem to react with the preceding layers to cause
the whole refinishing effort to wrinkle up and look more like 'Krinkle
Finish' than gloss black.
I have dutifully tried to follow the instructions ( not a natural act...)
and observe the correct waiting time between coats, air temps, clean
surfaces, etc. Still, at the most critical times, the paint will suddenly
erupt leaving me no alternative but to wipe the whole thing clean, or let it
dry and try to sand it back to some semi-textured state. I have called
Rustoleum on this problem, and they mumbled something like " sounds like
trapped thinner in the lower layers", which I do not readily believe. When
I spray a car with a good self etching primer and a couple of topcoats of
Centauri or Delstar Acrylic enamel, I have never seen a similar problem (
unless of course the surface is still covered with Simonize...) and I'm sure
that paint is full of trapped thinners...
Has anyone seen this problem, and if so, what magic words must I say
to avoid it? I sprayed my seat frames last night, and when I checked 'em
this AM, the 'grunge' had visited me yet again, just what you need on a
Monday morning....
Thanks
Bob Westerdale
59 3A TS36967E
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