Yeah, Flex Seal has its limits. I remember helping my uncle patch up his shed roof a while back—he insisted on using that stuff thinking it'd hold up fine. Worked okay for maybe a month or two, but once the weather started shifting between hot days and cold nights, cracks started showing up again. Switched over to proper flashing tape and haven't had an issue since. Lesson learned the hard way, I guess...
Yeah, Flex Seal can be hit or miss depending on the situation. Had a similar experience myself when I was dealing with a leaky gutter at one of the properties I manage. Thought I'd give it a quick fix with Flex Seal—figured it'd save me some hassle. It held up fine for a few weeks, but once we got into those days where it was freezing overnight and sunny during the day, it started peeling and cracking pretty badly.
Ended up chatting with a roofer buddy who explained that metal expands and contracts quite a bit with temperature swings, so something flexible yet durable like flashing tape or even proper sealant designed specifically for metal roofs is usually better. Switched over to flashing tape myself after that conversation, and it's been solid ever since.
Makes me wonder though... has anyone had long-term success with Flex Seal in outdoor applications? Maybe it's just better suited for smaller indoor fixes or temporary patches rather than anything exposed to harsh weather conditions.
I've had mixed luck with Flex Seal outdoors too. Used it on a cracked birdbath once—worked great for a summer, but winter killed it. Seems like temperature swings really do it in. Indoors though, it's been pretty reliable for me.
Yeah, Flex Seal outdoors is a bit hit or miss for me too. Remember when I tried patching up a gutter leak with it... worked like magic through spring and summer, but winter came and it cracked right open again. Maybe it's just not built for our crazy weather swings? Indoors though, I've sealed up a leaky pipe under the sink and it's been golden ever since. Maybe Flex Seal's secretly an indoor cat?
Had a similar experience last year when I tried Flex Seal on some flashing around my chimney. Looked great at first—held up through summer storms no problem. But once winter hit, it started peeling and cracking like yours did. Honestly, I think it's the temperature swings and freeze-thaw cycles that do it in outdoors. Indoors, it's been solid for me too—patched up a basement pipe leak two years ago and haven't had issues since.
Ended up swapping out to proper metal flashing with roofing cement for the chimney fix. Bit more hassle upfront, but zero issues since then, even through heavy snow and ice buildup. Guess some things just need the old-school approach...
