Anyone else annoyed by how fast roof coatings peel off?

Had a client once who tried every “miracle” coating on his old metal shed roof - by year three, it looked like a patchwork quilt and still leaked like a sieve. Sometimes I think the only thing those coatings are good at is giving you a new annual hobby. But I get why folks hesitate to swap panels, especially with prices these days. Has anyone actually had a coating last more than a couple seasons, or is it just wishful thinking?

- Tried two different "elastomeric" coatings on my old corrugated roof. Both looked great for about a year, then started peeling in big sheets.
- Prepped like the directions said - pressure wash, dry, etc. Still didn’t last.
- Noticed the seams and screw heads were always the first spots to fail. Once water gets in, it’s game over for the rest.
- I get the appeal - cheaper and less hassle than panel replacement - but honestly, I’m not convinced any of these coatings are a long-term fix, especially with freeze/thaw cycles here in the Midwest.

Has anyone had better luck with coatings on a roof that isn’t super rusty or pitted? Wondering if it’s just the age/condition of the metal that makes coatings fail so fast... or maybe climate plays a bigger role than the product itself?

I hear you on the seams and screw heads being the weak spots.

Once water gets in, it’s game over for the rest.

That’s exactly what happened on my dad’s old barn roof - looked fine until one winter, then it just started bubbling and peeling right at the fasteners. We’re in northern Indiana, so lots of freeze/thaw too. I’ve always wondered if anyone’s tried those “patch tape” products on the seams before coating? Maybe that helps, or maybe it’s just delaying the inevitable...

I’ve always wondered if anyone’s tried those “patch tape” products on the seams before coating? Maybe that helps, or maybe it’s just delaying the inevitable...

Tried the patch tape route on my garage roof last fall - honestly, it slowed things down but didn’t solve the problem long-term. Once that Indiana freeze/thaw cycle kicks in, the tape starts to lift at the edges and water finds a way in anyway. For the price, it’s not a bad temporary fix, but I wouldn’t count on it for more than a season or two. Sometimes I think these coatings are just a fancy way to buy time until you have to do a real repair...

Sometimes I think these coatings are just a fancy way to buy time until you have to do a real repair...

That about sums up my experience too. I tried patch tape on the seams of my old shed roof before putting down a rubberized coating, thinking it’d at least give me a couple extra years. Looked good for maybe six months, but once we hit our first Michigan winter, the tape started curling up at the corners. By spring, water was sneaking in again and I was back up there with buckets and cursing my “shortcut.”

I get why people try it - those full tear-offs or pro repairs aren’t cheap. But honestly, after going through two rounds of patching and coating, I probably spent almost as much as if I’d just paid someone to do a proper seam repair in the first place. It’s like playing whack-a-mole with leaks.

The coatings themselves... mixed bag. Some brands seem to last a little longer, but nothing’s really stood up to the constant freeze/thaw we get here. And once that bond breaks in one spot, it spreads fast. I’ve noticed that prepping the surface helps a bit (cleaning, priming), but even then, you’re just delaying things.

If you’re on a tight budget like me, I get trying every trick in the book. Just don’t expect miracles from patch tape or coatings - especially if your roof is already showing its age or has movement from temperature swings. Sometimes I wonder if these products are more about peace of mind than actual long-term fixes... but hey, sometimes that’s worth something too when you can’t shell out for a new roof right away.

Curious if anyone’s found a combo that holds up longer? My neighbor swears by mesh tape plus elastomeric coating, but I haven’t been brave enough to try that circus yet.