Yeah, it’s kind of a gamble every time, isn’t it? I’ve had jobs where we did everything by the book—scrubbed, dried, checked the weather—and still got caught by a freak dew or pop-up shower. Ever tried using a leaf blower to speed up drying? Sometimes it helps, sometimes it just stirs up more dust... Nature definitely keeps us on our toes. But when it all lines up, those coatings can really hold up. Just wish “perfect conditions” weren’t so rare around here.
Yeah, it’s frustrating how unpredictable it can be. I’ve tried the leaf blower trick too—sometimes it seems to help, but other times I end up with grit all over the fresh surface. Around here, humidity is a bigger enemy than rain half the time. I’ve noticed that even after a solid prep job, if the overnight temps drop or the dew sneaks in, the coating just doesn’t bond right. Makes you wonder if those “ideal application windows” on the can are written for some fantasy climate.
I get where you’re coming from about the “fantasy climate” on the can, but I’ve actually had decent luck sticking to those windows—at least as much as possible. I’m in the Midwest, so humidity and temperature swings are a constant headache, but I’ve found that if I wait for a stretch of stable weather (not always easy), the coating holds up a lot better.
“if the overnight temps drop or the dew sneaks in, the coating just doesn’t bond right.”
That’s definitely true, but I’d argue that surface prep is still the bigger culprit most of the time. Even with perfect weather, if there’s any leftover dust or chalkiness, it seems like the coating just peels right off after a season or two. I started using a trisodium phosphate wash before applying anything, and it made a noticeable difference. The leaf blower trick is handy, but it never gets everything.
Not saying the climate warnings aren’t frustrating—they are—but sometimes it’s just about stacking every little advantage you can get. Still, I wish they’d make products a bit more forgiving for those of us who don’t live in California...
I’ve run into the same headaches with coatings not lasting, and honestly, I’m not sure there’s a perfect answer for those of us outside the “ideal” climate zones. I’m in upstate NY, so we get wild swings—hot, humid days followed by chilly nights, and that dew is relentless. I’ve tried to time my projects for those rare stretches of dry, mild weather, but it’s like playing roulette. Even then, I’ve had coatings start to bubble or peel after just a couple seasons.
You mentioned surface prep, and I totally agree that it’s a huge factor. The first time I did my garage roof, I just swept it off and figured that was good enough. Big mistake. The coating started flaking off by the next spring. Since then, I’ve gotten borderline obsessive about cleaning—pressure washing, TSP scrub, even going over seams with a wire brush if there’s any hint of old residue. It’s a pain, but it does seem to help.
Still, I wonder if some of these products are just too sensitive for real-world conditions. Has anyone actually seen a coating last the “10 years” they claim on the label? I haven’t. Maybe in California or Arizona, but here? Not a chance.
I also wonder if roof material plays into it more than we think. My neighbor has a metal roof and swears his elastomeric coating lasts longer than mine does on asphalt. Could be the smoother surface or maybe just luck.
At this point, I’m half-convinced the best you can do is stack the odds: prep like crazy, watch the weather like a hawk, and cross your fingers. But yeah... would be nice if these companies made something that could handle a little Midwest humidity without peeling off in sheets.
Funny, I was just talking to a buddy about this exact thing last weekend. He’s in Vermont and says the same—no way those coatings last 10 years up here, even with perfect prep. I’ve only ever gotten maybe three good years before stuff starts peeling or cracking, and that’s after basically scrubbing the roof like I’m detailing a car. I’m curious if anyone’s had better luck with those newer “cool roof” coatings, or are they just as fussy? Seems like every product promises miracles, but our weather just laughs at it.