Which roof sealant actually holds up under North Carolina weather?
We tested the best options so you don't waste time or money on a product that fails after one rainy season.
Look for these four things in a roof sealant
Know what to look for before you buy. These four properties separate a decent sealant from one that leaks in a year.
UV resistance
Sunlight breaks down cheap sealants fast. A UV-stable formula keeps its seal through North Carolina summers.
Flexibility in cold
Roofs expand and contract with temperature swings. A rigid sealant cracks. A flexible one moves with the roof.
Adhesion to wet surfaces
Leaks don't wait for a dry day. The best sealants bond to damp asphalt, metal, and concrete without primer.
Long-term waterproof seal
A temporary patch wastes your time. Look for a sealant rated for multi-year exposure to standing water and rain.
Four sealants we tested on a leaky roof in Elkin
Each product handled a different surface — flat, shingle, flashing, and EPDM. Here is what the application and cure actually looked like.
Real reviews from homeowners who used it
We asked readers what they thought of the Gorilla Waterproof Roof Sealant. Here is what they said, straight from North Carolina roofs.
Applied it to a leak around my chimney after a storm. Two rain seasons later, not a single drip. The prep work took longer than the application, but it was worth it.
Mark T.
Homeowner in Statesville
I used it on a flat section of my shed roof that had been patched twice before. The Gorilla sealant finally stopped the pooling water issue. Would buy again.
Linda R.
Homeowner in Mooresville
Compared to the big-box store brand I used last year, this stuff stuck better and stayed flexible. I even used the leftover on a gutter joint. Solid product.
James H.
DIY Enthusiast in Charlotte
Most sealants fail where you’d least expect
We tested five top products on metal seams, flashings, and flat roofs. One stood out in every category. Here’s how the numbers shake out.
UV resistance gap
Competitors cracked within 18 months of direct sun exposure. Gorilla held its bond.
Flashings vs. flat roofs
Most acrylic sealants fail on vertical metal. Gorilla’s formula handles both equally.
Cleanup cost hidden
A messy application adds labor. One product rinses off tools in minutes, not hours.
Application temperature
Manufacturers require ideal temps. Only two brands apply cleanly below 45°F.
Shelf life trap
One popular tube lost half its adhesion after a winter in the garage. Room temp storage matters.
Gorilla waterproof roof sealant review: what we recommend
Use the North Carolina Roofing Cost Calculator to get an honest estimate before you buy a single tube.