















🛡️ Seal smart, stay dry — protect your home like a pro!
MasonryDefender Chimney Flashing Sealer is a flexible, durable, and easy-to-apply waterproof sealant designed to protect chimney flashings and rooflines from water leaks. With a black finish covering up to 14 sq. ft. per 2.2 kg container, it resists cracking and weather damage, ensuring long-term protection against water intrusion and structural damage.













| ASIN | B08F832CKL |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #167,084 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #389 in Hardware Sealers |
| Customer Reviews | 4.6 4.6 out of 5 stars (135) |
| Date First Available | August 4, 2020 |
| Item Weight | 4.91 pounds |
| Manufacturer | SaverSystems |
| Package Dimensions | 6.85 x 6.54 x 5.12 inches |
M**K
SO FAR SO GOOD
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 winner Thanks
F**T
Much better than expected
I expected this to put a thin layer of protection over the metal on the chimney flashing, but it was far thicker and easier to apply than I imagined. It was able to fill in all the little gaps easily, and the finished cured coating seems tough, flexible, and thick enough to withstand the weather. I could not be happier, really.
N**R
Chimney sealer
I thought this product to be on the pricey side but I had a leak around my chimney for a few years and tried just about anything Home Depot had to offer. Not only fixed my leak, It worked on my leaks I had on my metal roof as well.
A**I
Easy to use
Brilliantly executed and very easy to use, would recommend it for anyone looking to save money by doing it yourself. With the the fiber roll you can’t beat the results.
J**!
Crown coat
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.
R**A
It is easy to use and it works
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.
L**S
One year later... looks great, no damp
My first chimney damp issues, did a lot of research and a few people told me this was a good product, a few told me to avoid. I thought I'd give it a go and if it bought me some time to get some money together for a full chimney recrown then great. One year later, no leaks, no damp. This fixed it and still looks great!
K**E
Works great!
Very easy to apply and is thick enough to full in holes/cracks. I used it about 6 months ago and haven't had a leak since!
Trustpilot
1 month ago
3 weeks ago