ChimneySaver FlashSeal Elastomeric Roof Chimney Flashing Sealant - Waterproof, Flexible Seal - 1 Gallon (White)

I ordered this product to repair a nagging chimney leak that I could not seem to remedy with roofing caulk. After the 3rd failure to fix the leak I ordered the Chimney Saver. After the first rain I didn’t encounter a single leak. Although time will tell the whole story I am so far impressed with this product. It was easy enough to apply and very easy to clean up. I bought the Flash Seal reinforcement mesh that is recommended with this product which also helped to create a nice thick layer around the bottom of the chimney. I used duct tape to make a clean application line around the base which worked like a champ. I had some left over so I sealed the top part of the chimney where the mortar was starting to crack. This stuff is a little pricey but it does the job. Saving the expense of calling a roofer was well worth it. Update: The Dallas area that I live in just got hit with a terrible storm that produced extremely high winds and copious amounts of rain. I am happy to report that the repair job on my chimney held up beautifully. Not one drop of water made it through. I now have to say that this product is battle tested, tried and true. This storm was one of the worst that I can remember in several decades so I would gladly tack on some more stars if I could.

Excellent sealant specifically formulated for chimney flashing repair. I had a small seeping leak of rain drops going along the chimney inside the attic. Wasn't a big deal, but I didn't want to take any chances. I highly recommend this to mend your chimney flashing woes rather than spending thousands on roofing experts. For less than $100 you can do it yourself and be proud of a great job! The application is easy with a standard wide 3" paint brush and goes on like frosting on a cake. Rather easy to use and seals nicely. I highly recommend using the reinforcement fabric to make your seal nice and tight. I was going to go the cheap route and buy some standard drywall seam tape, but it wasn't wide enough for my application. I bought the brown color because my roof is tan/brown and it blends right in like camouflage perfectly! I'm glad to have found this product here, as it can't be purchased anywhere at local big box hardware stores. I'm waiting to see it dry and test it with the next large rain storm to see if it works. This product could also be used around roof vent-pipes or around skylights from what I read.

We had three leaks where our chimney met the roof line. Applied as directed and all three cracks/leaks are sealed. Using the fiberglass mesh tape is the way to go. Really makes the product stronger and I think will last for years. Oh yes, working from top to bottom helps seal everything and it bonded to both flashing and the brick.

This review is from someone who is average in the expertise department. Not a master builder. For those odd cases when you cannot apply step flashing and counter-flashing, this type of product is a good candidate for a plan B. It is easier to apply than step+counter flashing because you don't need a metal brake and you don't need to cut a kerf into the chimney brick. However, I wouldn't substitute this on a chimney where it is possible to do the flashing (aka plan A). So, knowing that, you decide plan B is your best approach and find FlashSeal... This is like a paint-on caulk with particles suspended in it that are "quartz" (didn't that stuff used to be called by a different name?). I wouldn't use it without fiberglass reinforcement tape. It works much like stucco repair in that you lay down a scratch coat of FlexSeal, embed the fiberglass tape, then coat it with a second layer of FlexSeal. Here's my impressions from using it. The types of jobs where this product is chosen are usually too rough to be strict with the thickness recommendations given on the product. I had to error on the thicker-than-recommended side in order to get all defects sealed. That also means the coverage estimates are referring to ideal settings. Don't expect to get the published coverage. Some things I learned when applying are that foam brushes, at least the ones I found, did not work. A cheap bristle brush worked better. Also, after applying the fiberglass, brushing towards the creases/angles/bends when applying the second coat of FlexSeal helped keep the fiberglass in the crease instead of stretching it away so that you have to push it back into the goop. It was also difficult to work fast enough to make sure it doesn't dry before finished, so plan everything before starting. If there were a slightly longer dry time, more realistic coverage estimates for the typical rough repair situation, and more ingredient details (quartz?), then it would easily earn 5-stars.

This stuff worked as advertised. I had a leak on the inside of my chimney that no roofer wanted to touch. So I finally purchased this product(with the fabric tape) and applied it to the base of my chimney around the flashing. It worked great and no more leaks. Worth every penny and easy to use.

I used it to seal a leak on a stone coated metal roof edge. The roof was installed improperly, It had been leaking slowly over the past 10 years. I hadn't noticed. as it was over a car port. Last month the roof dropped 2'. Both of the 2x10's had rotted. The roof was red, so I got the brown and added red dye for the final coat,and sprinkled some red stone granuals over it, and now its barely noticeable. On my tests. it hardens nicely, even with the dye in it.. I was so happy when I opened the container, and it was really thick stuff. It made it impossible to drip off the paint brush. Joe Schumacher

I have uploaded 2 pictures to show the before and after. The chimney was covered in tar and was leaking due to cracking of the tar. Rather than remove the old tar, the previous owners would just add more tar on the cracks, which did not seal properly. This new sealant brushes on like paint and dries very quickly. it also, finishes much smoother and cleaner than tar. I am very happy with the product, as I have used it on my big brick chimney, 2 years ago, with no leaks.

This stuff is the best I’ve ever used on my flashing. Beats the thunder out of the old black tar products. It’s a little pricey, but absolutely worth it! I put on a double coat and it STAYS WHERE YOU PUT IT! Forms a fantastic seal. You can see it on YouTube.