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FlexSeal - ever really considered it?

1726 Views 7 Replies 7 Participants Last post by  NYgutterguy
Ok, I'll admit it....Although the ads are a joke, I'm giving it some thought for a roof leak around a pair of skylights (side by side). I'd use the Rustoleum knock-off. Anybody else? I can't figure out this %$#%^ leak. I'm starting to wonder about the 1.5" gap between the two skylights. Grrrr.
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It's junk. I bought some to investigate. While it did hold water on a screen, it did not make a leaking gutter joint water tight.

Next time I need to make a screen door hold water it will be my go to material, otherwise it's a typical "As Seen On TV" product and meant for the late night TV watcher with room on their CC.
If these are good skylites with a counter flashing I would be more of the mind of making a U shaped channel flashing to go in the 1.5 then try to fix it with clauk.
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Thanks. I was curious to try it first-hand. Appreciate the scientific method.

Side note on gutter seams: I know others have mentioned geocell caulk for them, but for an occasional repair, I've had success with the gutter patch kits - the one's with aluminum face and thick-grey backing. Sticky as heck on a clean surface and don't seem to tear or come loose. I put 'em on the inside surface.
It's junk. I bought some to investigate. While it did hold water on a screen, it did not make a leaking gutter joint water tight.

Next time I need to make a screen door hold water it will be my go to material, otherwise it's a typical "As Seen On TV" product and meant for the late night TV watcher with room on their CC.
Turn in your card now. Anyone considering this as an alternative shouldn't be allowed on a job site.
Easiest and best option. Done it a few times.
Randy Bush said:
If these are good skylites with a counter flashing I would be more of the mind of making a U shaped channel flashing to go in the 1.5 then try to fix it with clauk.
The initial thing that turned me off was the price. $13 a can was just way too much. :no:

I believe that FlexSeal can stop most leaks for a very long time. But what they don't tell you is that 90% of the time you'll never reach the actual cause of the leak with the spray nozzle.

If this product does everything it claims to do, I'd be willing to bet that there are several more products in the paint and hardware aisle that do the same thing with better results for less than half the price. PlastiDip in the aerosol spray can is between $5-$6.
gutter patch kit? :blink:
Thanks. I was curious to try it first-hand. Appreciate the scientific method.

Side note on gutter seams: I know others have mentioned geocell caulk for them, but for an occasional repair, I've had success with the gutter patch kits - the one's with aluminum face and thick-grey backing. Sticky as heck on a clean surface and don't seem to tear or come loose. I put 'em on the inside surface.
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