I just hired a contractor to paint my house. I had purchased Duration
exterior latex in advance. The contractor wasn't familiar with
Duration and thinned it with water, probably by 15-20%. The label,
which he didn't bother to read, clearly says "do not thin". I probably
should have reminded him not to thin it beforehand.
He also thinned the SW A100 primer I supplied, and as a result, he had
to use a lot more of the (thinned) Duration to get a decent coverage.
I'm wondering if the paint has been compromised and if the benefits of
Duration are now gone, compared to a cheaper paint. Would it help to
add some unthinned paint to it to thicken it up? Or perhaps SW sells
some kind of concentrated paint to use as a thickening agent?
Or can this problem be solved by just applying an extra coat? I just
hope I didn't waste a thousand bucks on paint ;)
The good news is that he only did the eaves and one wall so far.
Other asshole-like responses aside, I'll try to provide a real answer.
GENERALLY speaking, latex paint can take a little thinning without
SERIOUS consequences to performance. 20%, will definitely affect
performance, however, because the concentration of solids in the
thinned mixture is much lower. What you have is now probably around
the level of cheap contractors paint. This can be made up with an
additional coat of unthinned paint.
Negotiation will be a pain, but you paid for the performance of
duration finish, and because of his action, he should eat the
additional cost of providing you with a finish of that performance.
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