Chimney Crown Sealer - Brushable Waterproof Sealant Prevents Leaks - 1/2 Gallon

My chimney used to leak like it was emotionally unstable. Rainstorms? Cue the buckets. Snow? Instant anxiety. Then I found this crown sealer — thick, brushable, and clingy in a way that actually helps your relationship with your roof. It spreads on like frosting, fills every crack like it’s got a grudge against moisture, and dries into a rock-solid barrier that laughs in the face of rain, snow, sleet, and freeze-thaw drama. Application was surprisingly easy — just grab a brush and channel your inner Bob Ross. Took me less than an hour and I didn’t even have to Google “how to fix a chimney leak” afterward. Weeks later, storms rolled through and… nothing. Dry as a dad joke in the desert. If your chimney is crying for help, this is the therapy it needs — easy to apply, built to last, and tough enough to survive whatever the sky throws at it.

While long term results can't be guaranteed, initial impressions are very good. As long as you prepare the surface correctly, this stuff will stick well. One negative review I saw showed the product had been applied to a very dirty surface. Just like painting, surface prep is one of the most important steps in the process. As well as a chimney cap, it was applied to the top of a small retaining wall along our driveway and looks a lot better than bare concrete.

Worked good to restore my chimney cap.

Four stars because I only applied it last month. But so far, so good in an exceptionally rainy fall in the Pacific Northwest. When a puddle appeared in front of my gas fireplace insert, I tied a rope around the chimney and got up on the roof. There were cracks in the chimney crown which seemed to be made of crumbly mortar. Maddening because the mason charged me a fortune for it not very long ago. The product was easy to apply. There are some very good YouTube instructional videos incl. one that features a woman applying the product and talking thru all phases. I have a large chimney with three stacks so had to a lot to cover on a steep roof. My work wasn't quite as neat (bring a wet rag with you) and I think I applied it too thick because it wasn't quite set up when I climbed down. Rain started again shortly after but no water got in and everything has been dry since. It looks good from the street and so there's no water getting into the chimney. Recommended.

Great product. Love the outcome. Follow the directions and results are as stated!

i sealed my whole chimney with 1 container. I really worked it into the brick and mortar with a brush. Expensive but says its good for 20 years. I never want to do that again. I hope its working, i dont really know.

Easy application and great value.

Worked well, it has a consistency similar to peanut-butter. Let it dry between coats. Effective to use duct tape to mark off above and below, then peel off the duct tape once dry for a nice clean line. I used 3 coats. For cracks, I used latex caulk, and was able to paint this on right over top of the caulk, no worries. I am happy that I used 3 large moving blankets that I taped to the chimney and draped underneath, as that caught a few drops and splashes. This is latex, so make sure you use in conjunction with genuine latex caulk, don't second guess the instructions and go silicone.

I don't usually write comments, but this product fixed my leaky chimney. I was struggling with root causing the leak. After applying, few heavy pouring tested, no leak anymore. My chimney is dry and my ceiling is dry. Thank you.

The winter will tell, but so far, has set well. It was easy to use, with clear instructions. The stuff is like thick toothpaste. Coverage is as good as advertised.

Had a cracked crown that really leaked down into the chimney cavity. Found this stuff on Amazon. Got a chimney guy here in Australia to apply it while he was cleaning the chimney. Since then we've had record rain and no leaks so it must be working. The chimney guy in Australia hadn't heard of it before but was really impressed and did a deal where he took the remaining and reduced my bill! Time will tell if it lasts but so far it's saved me at least a few hundred dollars.

Seems like an excellent product ….my chimney will let me know over time. Expensive and overpriced but nothing better available.

Very happy with product. Nice to work with. Ken