Flex Seal Clear Rubber Sealant Spray 2-Pack
Flex Seal's clear spray-on rubber sealant does what it promises — lay it down on a leaky gutter or a cracked skylight and it seals up tight without leaving a trace behind.
TL;DR Summary
Pros
- Clear finish dries nearly invisible — ideal for skylights, windows, and visible surfaces
- Flexible rubber formula moves with the substrate, resisting seasonal cracking
- 2-pack value gives enough material for thorough multi-coat coverage plus a spare
- Fast application with no special tools — spray, let cure, done
- Effective across a wide range of surfaces including gutters, wood, RV seams, and roofing
Cons
- Porous surfaces like bare wood eat through coverage faster than expected
- Requires dry conditions and moderate temperatures for proper cure
- Aerosol format limits precision on very small or tight repair areas
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Extended Observations
Flex Seal's clear spray-on rubber sealant does what it promises — lay it down on a leaky gutter or a cracked skylight and it seals up tight without leaving a trace behind.
I'll be honest: I came to Flex Seal the same way most people do — standing on a ladder in the rain, staring at a gutter seam that had given up on life. I'm an audio guy by trade, but I own a house, and houses leak. What I needed was something I could apply fast, that would hold, and that wouldn't look like I'd patched the place together with duct tape and regret. The clear formula in this 2-pack delivered on all three counts.
The application is genuinely foolproof. Shake the can, spray an even coat, let it cure, repeat if needed. The rubber coating goes on smooth and levels out nicely — no drips, no runs if you keep the can at the recommended distance. On gutters and around a skylight frame, it dried to a flexible, nearly invisible film that has held up through several hard rains without flinching. The clear finish is the real differentiator here; on surfaces where aesthetics matter, you're not left with a white or black patch screaming at you from across the yard.
The 2-pack value proposition is solid. Two 14 oz cans give you enough material to do a proper job — multiple coats on a problem area — plus keep a backup for the next thing that decides to leak. For what amounts to a per-can price that's competitive with single-can alternatives, the bundle makes sense for anyone tackling more than one small repair.
Flexibility after cure is a genuine strength. Unlike rigid sealants that crack when a surface expands or contracts with temperature, this rubber coating moves with the material underneath. On wood fascia and RV seams — surfaces that breathe with the seasons — that elasticity is not a minor detail, it's the whole ballgame. I've seen rigid sealants fail at the edges within a single winter; this one hasn't shown that tendency.
A couple of caveats worth naming: coverage can go faster than you'd expect if you're spraying on a porous surface like bare wood, so plan your coats accordingly and don't assume one can will handle a large area. And like any aerosol sealant, this needs dry conditions and reasonable temperatures to cure properly — spray it into cold or damp air and you're working against yourself. Neither of these is a dealbreaker, just things to know going in.
Our Verdict
Flex Seal's clear spray-on rubber sealant does what it promises — lay it down on a leaky gutter or a cracked skylight and it seals up tight without leaving a trace behind.
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What customers are saying
13 reviewsThis product performs exactly as described. It's an excellent choice.
Applied it to the bolts on my inexpensive metal shed roof and it successfully prevented any water leakage.
Solid product that does what it's meant to do.
Initially skeptical when this product launched, I eventually purchased it and found it to be an excellent solution for various repair projects. The application is straightforward and the durability is...
I've been a loyal user since the original release and there's genuinely nothing comparable on the market. While competitors offer similar products, none match the quality of this one. I'll continue pu...
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