ChimneyRx 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon

I really like this product! I like to maintain the flashing around my masonry chimney and I've always done it with a dab of some product here and there, but it is easy to miss an area that might have a gap if it is small. Last year we had an 11" rain here in WI and sure enough, just a small amount of water did leak in around the chimney. With this product you "paint" it over the entire flashing and where it meets the roof and the brick, so there are no missed areas - the entire thing is coated. The product applied quite easily - it's is fairly thick, but it did go on and brush out with a regular paint brush. I followed the instructions and masked the roof and the brick with duct tape and then applied the product. Once done, just remove the tape and you have an amazing looking job! In the on-line instructions the coverage is listed at 14 - 18 sq ft at a thickness of 1/8" for the 1 gallon size. In the Amazon listing it is listed as 12 sq ft, but the product is only 1/2 gallon, so that is not correct. I did 10 sq ft and used about half of the 1/2 gallon container. I would think I must have applied it about 1/16" thick. It is very hard to get an exact thickness when you are applying it.

I was a bit concerned when I opened the shipping box and saw that the lid of the plastic tub had leaked a bit, as though the lid may have popped from pressure during shipping. Sealer seemed ok. We assumed that our interior ceiling leak was from the chimney flashing. The sealer was brushed liberally around and on the flashing. The next 5 days we had heavy downpours. No interior ceiling leaks. Very pleased.

Easy to apply. So far after several rains it seems to be working great.Took about an hour to apply. Easy cleanup with soap and water.

Used this product, as well as both the 1 gallon brushable chimney crown repair and 1 gallon masonry water repellant, on a large ~ 3ft wide, 5 foot long, 4 ft tall chimney built in 1970 that was starting to get some spallimg on the brick work and had leaked in the past and been repaired many years ago. All products went on easy and provided more than enough coverage for the whole chimney with two coats. Haven't noticed any issues even with heavy rain. Will reuse as needed in the future, but expecting it to last a long time. Hoping to use the extra flashing product left over around some skylights. Just follow the instructions and you can't go wrong.

Worked great. Looks good and sealed the chimney and flashing.

Tricky this.. It works.. It paints on easily and forms a rubbery barrier that sticks to masonry as well as metal, but we found that in places where it failed (through other factors being too far gone) when we came in to remove it, it hadn't bonded well to the metal flashing. Sticks like crazy to asphalt shingles, and stone, but ironically the metal, not so well and came off in easy strips, suggesting it might fail more in situations with older flashing, which is unfortunately why you might be using such a product in the first place. It works, but if you need it, you're likely just putting off the inevitable of replacing the flashing that's been installed poorly, or rusted through. Might be more appropriate in situations where the mating edges of masonry or mortar have begun to loosen or are crumbled away. This would seal those edges together well, especially with the addition of some fiberglass mesh tape. I guess I secretly found myself wanting this to act like a caulked on asphalt wet patch, to become as one with the shingles.. And it isn't that. It's more like a thick acrylic paint, where now I've removed some that had thoroughly dried, I think the corroding flashing may just eventually shed the whole layer.

The product went on easy. I just had my first soaking rain and no leaks. Hopefully it will do better than caulk.

So far I've used this product around the flashing on two chimneys and the second chimney I will have to do one more flashing because it runs past another roof. So far this stuff applies really well and is really thick so it covers well. The texture of the product reminds me of deamplifier used in car audio applications, which is just interesting to me.... it covers very well in just two applications per the directions. It supposed to rain really hard in a day so I'll see how it holds up but I have no reason to believe that it will have any issues at all. I really like it and it seems very high quality.

Purchased this to seal around chimney. Applied it over fibreglass cloth and it worked beautifully. Looks great and stays flexible. Easy to apply.