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MasonryDefender Chimney Flashing Sealer is a flexible, waterproof coating that is applied to chimney flashings (where the chimney meets the roof ) to protect against water leaks. This permanently flexible membrane is easy to apply with a paint brush and will last for years. Available in black. This product not only seals chimney flashings, but can also be used around any other protrusions in roofs including skylights or vents. It provides a long lasting coating that is ready to use and can easily be applied with a paint brush. Covers 14 sq. ft. per half gallon (assuming 2 coats). Dries to touch in 30 - 60 minutes. Product cures completely within 6 - 12 hours depending on temperature/humidity. Caution: Do not use in cold, damp, rainy weather or product may wash away. Allow at least 12 hours of dry, clear weather for proper curing.
Long Lasting Performance
Long lasting protection for chimney flashings. Stays permanently flexible and won’t crack or chip.
Prevents Water Leaks
Water can come through cracks in your chimney and find it’s way into the interior of your home. This product seals & waterproofs the base of your chimney around the flashing.
Easy to Apply
Simply paint 2 coats of the product onto the chimney flashing with a paint brush. Use duct tape to help create a clean edge.
Water Based
MasonryDefender Chimney Flashing Sealer is a VOC Compliant Water-Based Sealer That’s Easy On the Environment & Easy to Clean Up
Coverage Rates & Dry Time
This product will cover approximately 14 sq. ft. per half gallon container (assuming 2 coats).
Dries to touch in 30 - 60 minutes. Product cures completely within 6-12 hours depending on temperature/humidity. Do not apply if rain is expected within 12 hours.
Dennis Collins
Reviewed in the United States on February 8, 2025
Works great. Plugged a small leak around the chimney.
Page Eight9
Reviewed in the United States on August 11, 2024
Good Product
Ladek
Reviewed in the United States on November 6, 2024
Easy to work with. Sealed a leak between the chimney and the roof
John M. Brown
Reviewed in the United States on November 14, 2024
This works extremely well how long it lasts I don’t know, but I’m very happy with the product so far
rza
Reviewed in the United States on September 26, 2023
My only complain is people packing these. Since it is not sealed if you put them on the side in a box it will leak. I received 5 items leaking in the shipping box. The product is very good it fixed the leaks.
Doc Souther
Reviewed in the United States on June 28, 2023
Quality product, easy to apply, forms a nice cosmetic long lasting seal around chimney and vent boots
mark
Reviewed in the United States on October 11, 2023
This stuff seems phenomenal , I applied it [ Colorado ] we have had a very wet 2023 Summer , now it [ October ] seems like a drought again . Go figure ... however after EVERY storm this year [ by the way , I did the flashing on my chimney ] it has been soaked and getting to my cinder block foundation . This is not good . Anyway , after this last heavy rain , I looked , behind fireplace ... perfecto ! This stuff sealed my chimney base , so far so good and it applies very easily .The application is VERY easy , it is water based , dries like oil based , that is seems strong , not lingering wet .By the way , other reviews say the paint brush is shot afterwards , not if you wash it pretty soon after application , it is acrylic , so it washes away . Mine did ... so far so good , we will see next Spring . I think it's a winnerThanks
Jayson !!
Reviewed in the United States on January 24, 2023
The only way to properly do a crown coat is to tape off the area because the stuff is like tar and once you put the coat on, there’s no going back and touching up until it fully cures. If you go back and touch it with your paint brush trying to fix spots it’s just going to get worse and worse and worse. Wait until it dries and go back into a second coat. Yes it’s a messy job but it’s a quick cheap fix. Use a wire brush make sure you clean the crown before you apply insure a good seal. The product itself works great. They should be paying me for such a great review, but it’s the truth.
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