Flex Seal 2-Pack Black 17oz Stop Leaks Instantly, Waterproof Sealant Coating For Gutters, RV, Roof, Skylights, Windows

I used it to seal a couple small cracks in a canoe. So far no leaks! Works as advertised

Works as it should! Helps seals, adheres well to different textures. Easy to apply to surface. Great value

PLEASE read to directions carefully because this stuff is full of dangerous and flammable chemicals. It does work for sealing leak causing cracks. Don't know how well it will last in sunlight but for a short term fix it seems to work fine.

Thanks to Mother Nature, and a moderately damaging hail storm, my camper trailer suffered some damage to the 2 roof vents, with some fairly large chunks completely knocked out. I had already replaced the roof vents in 2017, due to a worse hail storm, and wanted to consider an easier fix. So...I used Titebond glue to adhere strips of drywall repair mesh (comes in a long roll, like drywall tape) over the gaps and to stabilize the multiple cracks. I put a small piece of painters' blue masking tape on the inside of the vent where the mesh was open to the interior, as I couldn't find a good size chunk of the roof vent plastic. The following day I used the Flex Seal Max spray over the entire surface of both roof vents. I sprayed it on very thick, to completely cover the mesh tape. The consistency of this product is obviously thin enough to produce an easily-sprayed product, for better aesthetic coverage, but it was probably a bit too thin for my application. I also used a 2" disposable foam brush to try and get thicker coverage over the mesh taped areas, once the product had started to set-up. The product's solvent evaporates fairly quickly, so I made another spray pass over the hand-brushed areas for better looks, and in case I had disrupted the coverage, to avoid leaks. The job looks great and appears to be adequately sealed. I'm also hoping that the 'rubberized' coating may be more hail resistant. Plastics at Denver's altitude take a real beating from UV exposure, so I'll see how this idea pans out. This spray also may be a good idea as a preventative to avoid moderate hail damage. Update: after waiting several days for the Flex Seal to cure, I tried to remove the small strip of blue painters' tape from the inside of the roof vent. The Flex Seal stuck to it pretty bad, and stripped off a little of the product. Luckily, I still had some left in the large, 17oz can, and made another pass to seal off the few small holes. Hopefully I'm now done with this project!

Works great and easy to use in hard to get spaces.Effectiveness:fast to install.

I had a leaky birdbath that I sealed with this. Unfortunately, it took about 5 or 6 coats to create a complete seal. The birdbath held water except for a minor crack so it should not have required that many coats.

Resolved my problem with a leaking fiberglass camper shell. It took two full cans to cover two coats over my 8-ft camper shell.

I have a fiberglass camper shell on my Ram and haven't been able to stop the leak(s) around the double doors. I cleaned the area, sprayed around everything penetrating the shell, no more leaks.