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painting in the sun

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Tom Burrell
4/15/2016
I plan on painting my roof this weekend. I'm using cryl-pro primer and Sherwin Williams Industrial Acrylic DTM. The temperature is supposed to be 70 and sunny both days. Will the sun be a problem and if so, how much of a problem? Thx.
Eric Novotny
An informed customer is the Best Customer!
4/15/2016
I would default back to what the materials manufacturer says. They are probably more concerned with ultimate surface temperature more than anything. https://protective.sherwin-williams.com/contact/
Tom Burrell
4/15/2016
I'll do that. The paint has a data sheet on www.paintdocs.com. Under the "Application" the temperature range is 40 degrees minimum and 120 degrees maximum. I don't think that the temperature of the roof will reach 120 degrees at 70 and sunny. But I should be able to avoid the highest temperatures by painting in the morning and early afternoon.
Eric Novotny
An informed customer is the Best Customer!
4/15/2016
Sounds good. Post up some pictures if you get it done.
Tom Burrell
4/19/2016
I painted this weekend. Sunny 70 and 74 for Saturday and Sunday. The mistake I made was prepping for and attempting to use a sprayer. I didn't consider the need for backrolling and the sprayer clogged badly. Rolling was so much easier. If I had rolled from the beginning, everything would have gone as planned. The sprayer left a lot of puddling in between strokes. Those puddles of primer blistered some underneath the first top coat. I added a second top coat. As it is not visible to anyone unless they are up on the roof, I wonder can I leave a marble sized blisters alone or should I scrape, prime, and paint it? If I have to address them, can I wait a month or so before doing so? As far as painting in the direct sun, I wouldn't recommend it even at 70 degrees. The morning was OK. But by the early afternoon, the metal roof was too hot to touch. The paint was smoking a bit when I put it on (yikes!). But besides the blistering in a few spots, everything seems to be ok. What do you all think? If I'm going to have a problem down the road, I'd rather know now. Thanks,

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