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Old 09-15-2013, 09:21 PM   #1
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Default Dew point problem

We frequently paint aluminum sidding. Lately we had a problem with dew drop or humidity on the sidding the day after we finished to spray. It leaves water streak on the sidding. Even if we stop painting at noon. I'm trying to think about solutions to make the latex paint dry faster. Was thinking of a propane heater but not sure if it would be effective or useful.
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Old 09-15-2013, 10:09 PM   #2
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I could tell you a horror story of metal siding and dew but I will save that for another day. I do not know that there is much you can do about it to tell you the truth the propane heaters put out a lot of heat but if the paint is not cured it could streak. I would try a fast drying paint like sw resilance see if that helps its supposed to be rain proof really fast.
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Old 09-15-2013, 10:09 PM   #3
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Are you back-rolling after spraying the latex?
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Old 09-15-2013, 10:25 PM   #4
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Originally Posted by SemiproJohn
Are you back-rolling after spraying the latex?
No, why would I on this type of sidding?
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Old 09-15-2013, 10:26 PM   #5
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Quote:
Originally Posted by jacob33
I could tell you a horror story of metal siding and dew but I will save that for another day. I do not know that there is much you can do about it to tell you the truth the propane heaters put out a lot of heat but if the paint is not cured it could streak. I would try a fast drying paint like sw resilance see if that helps its supposed to be rain proof really fast.
We use Dulux Diamond that is suppose to be rain proof after 30min
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Old 09-15-2013, 10:59 PM   #6
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Quote:
Originally Posted by MonPeintre.ca View Post
No, why would I on this type of sidding?
If the siding is dry before you spray, you wouldn't necessarily need to back roll. If the siding has any moisture when you spray, back rolling will mix the moisture into the paint. I feel for you, because down here in Central Florida, the paint dries on aluminum nearly as fast as you can apply it. Any subsequent rain, dew, etc. has never adveresly affected the paint in my experience.
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Old 09-16-2013, 06:24 AM   #7
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Do not use propane. Propane adds 20% humidity to the air. You will add to the problem. What product and finish are you using?
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Old 09-16-2013, 08:52 AM   #8
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Do not use propane. Propane adds 20% humidity to the air. You will add to the problem. What product and finish are you using?
We use Dulux Diamond that is suppose to be rain proof after 30min. Satin or matte
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Old 09-16-2013, 10:06 AM   #9
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That's surfactant leaching you're seeing.
We switch to AURA/Arborcoat (other gennex tint products should work as well) exclusively starting Oct 1 to avoid that problem.
It stopped being an issue once we started that system.

You can wipe those streaks off with a damp cloth.
They will also eventually wash off during rain but good luck convincing the HO that.
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Old 09-16-2013, 05:47 PM   #10
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I agree with Dan-o. Its surfactant leaching. A simple wash with a garden house will wash it off. It will look soapy when your rinsing it off. Its not dew
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Old 09-16-2013, 07:28 PM   #11
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It looks like that and it doesn't go away with wiping. My SW rep suggested SW resilience, we will give try at the end of the week.
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Old 09-16-2013, 09:04 PM   #12
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Quote:
Originally Posted by MonPeintre.ca View Post
It looks like that and it doesn't go away with wiping. My SW rep suggested SW resilience, we will give try at the end of the week.
Good luck with resilience I hate that crap.You'll spend most of your time trying to keep a wet edge!
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Old 09-16-2013, 10:05 PM   #13
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Dtm?
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Old 09-16-2013, 10:25 PM   #14
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Quote:
Originally Posted by mudbone
Good luck with resilience I hate that crap.You'll spend most of your time trying to keep a wet edge!
Shouldnt be a problem with the temp we have at the moment
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Old 09-17-2013, 01:06 AM   #15
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Try lightly rinsing it. That looks like surfactant leaching. Could be just the dew running down and streaking.
Resilience sets up fast but will still suffer from surfactant leaching especially in darker colors.
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Old 09-17-2013, 01:13 AM   #16
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Good luck with resilience I hate that crap.You'll spend most of your time trying to keep a wet edge!
Good luck with Sherwin Williams
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Old 09-17-2013, 03:00 AM   #17
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Quote:
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It looks like that and it doesn't go away with wiping. My SW rep suggested SW resilience, we will give try at the end of the week.
I painted Resilience up against Regal Select High Build last October in less than ideal conditions here in the Pacific Northwest. . . Regal set up quicker and with fewer surfactant issues.
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