Paint Tint Separation
bob...@my-deja.com
everything right.
Executive Summary: If you see tint separating quickly in the paint can,
assume it will also try to separate after applying. Make sure you apply
it under conditions in which it can dry quickly, before it can separate
on the painted surface.
Details: I painted a deck with a custom-mixed beige paint the other
day. The final coat took too long to dry, which gave some of the tint
time to separate from the base. It ended up beige in some areas, where
it was able to dry quickly, and green in others, where it took longer
to dry and some tint floated to the top of the coating. The only sign
that this might happen, which you can all hopefully learn from and
watch out for, was after mixing the paint, and waiting a few hours,
some tint separated and floated to the top of the paint can. If you see
that happen, plan to apply the paint under conditions in which it can
dry quickly (warm weather, low humidity, not applied too thick, not
late in the day where it may remain wet overnight), so it won't have a
chance to separate.
The specific product involved for the final coat was Behr
Interior/Exterior Low-Lustre Enamel Porch & Floor Paint (water-based)
(and Behr Premium Plus Water-Base Primer & Sealer for the primer coat).
Both were tinted the same color beige at Home Depot, based on a color
sample that I provided. I painted from 2pm to 5pm on a mild, 70F day,
with about 60% humidity. The temperature may have gone down to as low
as 50F that night (this is in NJ, where the sun sets around 6:30pm
these days). According to the instructions on the paint can, I was
doing nothing wrong. At 5pm, everything was nice and beige. Next day,
half the deck was green, particularly where I'd applied it thicker,
and/or closer to 5pm.
I called Behr to inquire. They weren't familiar with this type of tint
separation, but they agreed that the paint needed to dry faster, and
they agreed to pay for the additional paint that I'm going to need to
re-coat the deck. I gave them the tint numbers and amounts, and they
asked for receipts, and (optionally) photos of the results gone bad. I
suspect that the tint used by Home Depot was not compatible with the
base, in spite of the fact that the base says, "Do not use without the
addition of tinting colorants", and Home Depot's paint computer tells
their operators to mix this base with specific tints to get the color I
want. I noted some (very little, actually) separation with the
primer/sealer as well, but I attributed that to the fact that it was
being mixed "off-label", and maybe that primer/sealer and those tints
really weren't designed to be mixed (the paint computer doesn't
indicate how to color-match that primer/sealer, so they faked it out by
tinting the primer/sealer as if it were the final paint).
Sent via Deja.com http://www.deja.com/
Before you buy.
Bagelsnbrew
base and overloaded the tint, more likely there's a batch problem with the
base or the tint. They should have cut the tint formula 25-50% for the
primer and there's a *remote* possibility that the extra tint leached from
the primer. Primer can not accept as much tint as a paint base and a color
difference between primer and top coat is desirable to insure proper
coverage. I think HD only has UTC tints in store so they couldn't have
mixed in a solvent (industrial) tint. Did Behr ask for the batch number of
the paint? They should have! Next time consider going to a local
independent paint dealer instead of the "big box".
Andy
--
Start with "bagelsNbrew" then add a "@" and finish with "newsguy" a "." and
a "com"
Roger Shoaf
dollars "saved" are now hopelessly lost and gone forever. I would worry
about the new paint sticking to the bad paint over the long term.
--
Roger Shoaf
If you are not part of the solution, you are not dissolved in the solvent.
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