Anyone else annoyed by how fast roof coatings peel off?

I hear you on the freeze/thaw cycles - western NY here, and it’s the same story. I tried an elastomeric coating two years ago, thinking the flexibility would help, but it still started peeling at the seams by the second winter. I wonder if the prep work matters more than the product sometimes? I did a thorough cleaning, but maybe there was still some moisture trapped. Full membrane seems overkill for my small shed roof, but I’m running out of patience with patch jobs.

Those coatings always sound good on paper, but in my experience, the prep is everything - especially with our wild temp swings. Even a tiny bit of leftover moisture or dust can mess things up. Have you ever tried using a primer before the elastomeric? Sometimes that helps, but honestly, I’ve seen even the best stuff peel if the surface isn’t bone dry. Curious if anyone’s had luck with those peel-and-stick membranes just for seams, instead of doing the whole roof...

I’ve wondered about those membranes too, especially for older flat roofs where seams are the weak spot. Have you noticed any difference in longevity between using just the membrane on seams versus a full elastomeric coat? I’m always skeptical about how well they handle expansion and contraction with big temp swings...

Membranes on seams are a decent patch, but I’ve seen them fail just as fast as the coatings in some cases. Here’s what I’ve noticed after a few years of storm chasing and repairs:

- Full elastomeric coats tend to peel faster if the prep isn’t perfect. Any dust, old adhesive, or moisture and you’re looking at bubbles and flakes within a year or two.
- Membranes on seams only? They’re fine for minor movement, but once you get those big temp swings - especially freeze/thaw cycles - they start to lift or crack right at the edge. Water finds its way in, and then you’re back to square one.
- Expansion and contraction is brutal on both systems. Elastomerics claim flexibility, but I’ve watched them split right down the middle after a couple of rough winters up north. Membranes sometimes hold up better if they’re thick enough, but most folks go cheap and thin.
- Honestly, I’ve had better luck with a hybrid approach: reinforce the seams with a heavy-duty membrane (not the bargain stuff), then coat the whole thing with elastomeric. It’s more work upfront, but it buys you a few extra years before you’re peeling things off again.

One thing that gets overlooked - ventilation under the roof deck. If there’s trapped moisture or heat, nothing’s going to last long up there. Seen plenty of jobs where even the best products failed because of that.

Not saying coatings are useless, but I wouldn’t trust either method alone for long-term peace of mind, especially on older roofs that flex more than people realize. Sometimes patching just delays the inevitable tear-off...

Totally get what you mean about the hybrid approach - my uncle swears by that too. I’ve seen a few coatings bubble up just because we missed a tiny patch of dust. Drives me nuts. Prep work feels like half the battle, but even then, weather just does what it wants. Ventilation’s one thing I didn’t think much about until last summer when we found mold under a “perfect” roof job... definitely not fun.