Leak Stopper 1 Gallon Black Rubberized Roof Patch for Roof Patching and Repair
Leak Stopper 1 Gallon Black Rubberized Roof Patch for Roof Patching and Repair
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Leak Stopper 1 Gallon Black Rubberized Roof Patch for Roof Patching and Repair

4.5 stars out of 422 reviews
(4.5)|
422 ratings

Key item features

  • Revolutionary Patch: A major advancement in roof patching and repair, Gardner-Gibson Leak Stopper Roof Patch penetrates deep to help you stop leaks instantly.
  • Superior Formulation: Featuring Penetrex, a unique penetrating oil, and liquid rubber, this roofing patch reaches deep into cracks to form a complete, watertight seal.
  • Long-Lasting Repair: This rubberized roof patch is resistant to cracking and lasts 2-3 times longer than other roof cements, making it ideal for various roof types.
  • Easy Application: Use a trowel to spread Leak Stopper across the damaged surface, embed reinforcing fabric after the first layer, and apply a second layer on top of the fabric.
  • Versatile Use: Suitable for shingles, built-up roofs, SBS modified roofs, metal roofs, and many other surfaces, providing a flexible, high-performance plastic cement bond.
  • Year-Round Use: Formulated to be used year-round, best applied when surface temperatures are between 50 and 120 F, with special storage instructions for colder weather.
  • VOC Compliance: The product has a VOC content of less than 250 g/L, ensuring it meets environmental standards.
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Current price is Now $20.94
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was $26.93
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Customer ratings & reviews

4.5 out of 5 stars
stars422 ratings133 reviews
How item rating is calculated
  1. 5 stars77% (324)
  2. 4 stars11% (48)
  3. 3 stars4% (16)
  4. 2 stars1% (5)
  5. 1 star7% (29)

Reviews summary

Pros
  • : Offers a cost similar to others in its class.
  • : Forms a barrier to prevent water entry.
  • : Forms a tight seal to prevent liquid escape.
Neutral
  • : Can be smooth, but may require additional tools due to varying consistency.
Cons
  • : Ceiling fails to prevent water entry during rainfall.
  • : Requires extra effort to scoop and apply from the bucket.
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Showing 1-3 of 133 reviews

Sep 12, 2025
Walmart customer
Top Reviewer
Item details
Color: Black
Size: 1 gal
5 out of 5 stars review

Verified Purchase

Leak Stopper

This stuff works great! The leak stopper is very thick, easy to apply, and is an excellent sealant. I used this on my roof %26 it repaired my leak instantly. I've used this before on my old roof/house years ago. I even applied it in the rain several times on the old place %26 it completely sealed the leak.

Helpful?775CQF07ZPVT23332878
Dec 3, 2025
Pete
Item details
Color: Black
Size: 1 gal
5 out of 5 stars review

Verified Purchase

Good %26 Thick as should be

Works good, it applies nicely no dripping. It does let you correct over layers. Outside layer dries in about 24 hours or a bit more but softer inside. This would be in our location of temperatures in the 90-105 degrees. Always use gloves with this stuff. We always use WD40 %26 shop towels for the aftermath, hands cleans quick with a few rubs. We used it to repair the black felt and to patch some roof tins..

Helpful?775CQF07ZPVT23332878
Dec 14, 2025
Lisa
Item details
Color: Black
Size: 1 gal
5 out of 5 stars review

Verified Purchase

Black Jack gets the job done!!!

This Black Jack leak stopper is tough!!! Its very easy to spread, dries great and so far it has sealed the roof of my camper and kept it from leaking.It also doesn't dry out easily which is great for a person like me who sometimes forgets to seal lid properly.

Helpful?775CQF07ZPVT23332878