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All,
At Northrop Grumman, we
spent many months and thousands of Navy dollars studying various controlled
processes to apply the new mandated low volatile organic compound (low VOC)
coatings to achieve optimum adhesion, corrosion resistance and chip resistance
etc., which included the observation of inherent yellowing of epoxy
coatings. The bottom line of the several inches thick report is;
Use clean, virgin grit-blasted metal substrate surfaces, epoxy
primer and polyurethane topcoat. The epoxy provides better adhesion,
sealing and hardness, but chips easily and yellows. The polyurethane
is more color stable and chip resistant with lower adhesion and corrosion
resistant. Both respond favorably to elevated booth temperature and short
time intervals between coats. They didn't put all that nasty chemical
stuff in the original formulations for nothing. MEK, acetone, isocyanates
... all extremely harmful to humans but great for paint! Without as
much or with none of that nasty stuff ... very process sensitive at best, and
lower to unacceptable results at worst.
I vote for flat white epoxy primer, followed soon when
only partially cured by semi-gloss or gloss white polyurethane topcoat,
over a scuffed substrate, surgically cleaned before scuffing and vacuumed
after but not subsequently touched with paper, cloth or fingers. Don't
quote me, but a little extra nasty solvent would do wonderful things.
However, you might want to have a Democrat apply it for you!
Rod
Pharis
Legacy
40%
going on 30
I asked Michelle from Lancair to call the manufacturer
and ask if there was anything that could be done to prevent the yellowing of
the white tank sealer and she said they said that "yellowing is just something that happens with white
resin and they don't have any ideas of anything that can be done to prevent
the yellowing".
So that ends the Jeffco White Tank sealer
saga.
I will be using the PPG epoxy white mixed with
40% clear Jeffco resin. I decided to get an extra long hose for my scuba set
up and use that as a respirator.
Thanks for everyones input, is was helpful
in deciding what to do.
Kevin Kossi
Legacy 72%
New
York
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