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

I cut the bottom out of my boat and added a screen door. Used 10 cans of this amazing stuff to coat it. Out on the lake we went...I mean my boat is setting at the bottom of the lake and I lost my first mate, but still a day at the lake!

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

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.

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

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.

First, I will list my scores for Adhesion, Ease of use, and Water Resistance. Then, I will elaborate and give my final conclusions.Adhesion: 2/5Ease of use: 5/5Water resistance: 2/5Overall score: 3/5AdhesionThe initial coat stuck quite well with proper prep. I used denatured alcohol to clean the surface, then 60 grit sandpaper to rough the surface and help with bonding, and then another round of alcohol to clean dust. However, one coat will not give the desired results. Much like paint, areas lacking appropriate coverage are more visible when dry. This is where the adhesion becomes an issue. Proper prep, specially sanding, becomes difficult because this sealant is pliable even when dry. Its not possible to do more than the slightest scuff without the possibility of damaging the first coat. Due to the thick nature of the product, expect a lot of drips. The product is very runny fresh out of the can.Once the product is dry, the issues with adhesion aren't over. The commercials for flex seal (and the quality memes) make you believe the bond is like super glue on steroids. This is hardly the case. If there is any heat or any pressure this sealant will not hold. Heat causes it to soften, losing almost all integrity, and pressure will force water through the porous interior (caused by the aerosol delivery).Overall, the adhesion score is due to the drips on the second coat and beyond, and the lack of integrity at anything other then ideal (meaning low to no pressure and heat).Ease of useApart from drips making an even coat difficult on anything not planar to the ground, this is as easy to use as you think. The most difficult part of the process is prepping. The nozzle is fairly accurate and in my experience didn't clog. If you intend to use this sealant in a tight space, the can may be difficult to manipulate.While the can states its a skin irritant, it's not terrible if you get some on you. The toughest part will be peeling it off. Smell is comparable to paint. Tolerable to use with an n95, though respirator will be your best bet. Smell dissipates in an hour or less with ventilation. I do recommend using nitrile gloves and safety glasses.Overall, very easy to use.Water ReistanceAs mentioned in adhesion, any pressure will cause fluids to seep through the sealant. Depending on pressure, could be a sweat, could be a drip. Due to the viscous yet flowing fluid upon first use, even coats are difficult to achieve, which in turn effects sealing. There are pictures on the can of "recommended uses". One shows patching potentially leaking roof shingles, however, on the rear text on the can specifically states not to be used in roofing scenarios. While advertising a flexible barrier (which was attractive to me because I wanted a sealant that would withstand thermal expansion), the actual mechanic of flexing significantly compromises the seal. Hence, most likely, the warning against using it on roofs, since the can heat up to 160°F during summer.Overall, the score is based on the fact in nominal pressure and temperatures environments this will seal and hold out moisture, but in anything else the seal is questionable at best.The overall score of 3/5, and as the title alludes to, means that this sealant is meant for low stress sealing, specifically in areas that MAY leak (and not WILL leak). While not the best sealant, its easy use makes up for potentia shortcomings in other areas.

I use this on my shovel handle and outdoor work tools. It prevents splinters from those older dried out handles. It seeps into the cracks and groves providing a safer non slip grip.

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