GEOCEL GC55103 4500 Roof Bonding Sealant, 10 Ounce Cartridge, Black

Had a leak on my epdm roof and this sealant stopped the leak. Will definitely buy again

Needed to seal down some architectural shingles that got lifted in an 80 mph wind shear. I was luckier than most, my shingles didn't tear or break. In the past, I had mixed results with cheap asphalt repair products. They all instructed laying a house brick on the repair overnight. I had numerous repairs , so that wasn't an option. Besides, who wants to go back up on a 25 foot roof the next day to see if it worked or carry 30 bricks up there. A friend that works as a roofing contractor recommended this Geocel 4500. He said to wait for a sunny day and just hold the repair down with my hand for about a minute. He laughed about the house brick thing.This stuff is the real deal. I treated it like contact adhesive. Apply it to the surface, press it down, pull it apart slightly, then put your weight on it to seal it down. This stuff sticks! Did all the lifted shingles in about 45 minutes. I wore an old pair of mechanic's gloves and just threw them out when done. It's pretty unforgiving if you get it on you .Had another storm roll through a couple days later and every repair held firm. Only 45 mph wind this time, but they held.I didnt have any problem with hardening in the tube. I must've got a fresh batch. I set it in the sun on an asphalt driveway for a couple of hours before I started. It was nice and pliable on a 75 degree day.This worked as advertised.

Works in wet conditions. Pretty messy stuff but gets the job done.

I'd give it a 5 star but I need to see how long it lasts...and frankly I get susupicious when I see to many 5 star reviews on something. So far it's very good. If you've worked with EPDM you know it's not easy to find something that sticks and stays that way. Any petroleum based products makes it curl. This has stuck quite well. I even put a dab on a weathered piece with no cleaning at all. It' holding very well. It's also quite heavy for whatever that's worth. I also used to patch an area on shingles. It's done well with that..though lots of products can stick to asphalt.

Why did you pick this product vs others?:Word of mouth

I removed some satellite brackets from our house roof yesterday. The brackets weren’t being used, and they were an eyesore that I got tired of looking at while outside doing various projects. Once the brackets were removed, I cut pieces of flashing to slide underneath the composition shingles to cover the lag screw holes. I applied a generous amount of this sealant to both sides of the flashing before sliding the flashing under the shingles. I then used this sealant to fill the holes in the shingles down to the flashing. This product is messy, so wear some thin rubber gloves. I won’t know how this product worked until it rains. I will continue this review after it rains.🙏Returning to update review! It has rained numerous times on the repair site, and no leaks whatsoever. I’m sold on this product!

Just a heads up, you should probably use this as much as you can within the first 3-9 months. I opened the tube @ January, and left 1/3 of it for next season - I stored it indoors. It hardened in the tube. It hardened from both the tail end, and the spout end. About 2-3 tbsp in the center of the tube was still good.I'm not really complaining- the product seemed easy to use, and seems recommended by professionals. I'm just saying - it's probably a good idea to use it all up. Don't keep it around for next season's "just in case". I pulled a couple inches of dried stuff out of the nozzle, and could squeeze a couple tbsps out, so I thought I was good. I was not good, that was all that was left.To judge your date of manufacture:Look at the hollow bottom of the tube (where the plunger presses against). You should see a printed code, like, "ER1672ER".First two letters= where it was madeNext three digits= day of the year (167th day of the year in my case)Next digit= year (2022 in my case)From the Geocel website:How do I read the lot/batch code?Lot numbers are an important component in the manufacturing process as a tracking mechanism for inventory, complaints, sales history and quality control. It is also a beneficial tool for our customers as the lot numbers identify the time frame for when a product was manufactured.Most of our lot numbers consist of an eight-digit, alpha-numeric code. The first two letters in the code indicate where the product was manufactured. The next three digits represent the day within the year. For example, a product with a lot number of ER1016RB is translated as the 101st day of the year, with the “6” representing the year—2016. Or, said another way, the product was manufactured in early April of 2016. The location of the code can be found near the bottom of the packaging on either the cartridge plunger or around the UPC code area.

I tried this to reattach RV roof membrane to the plywood where it separated, and it did not work at all. Totally screwed up the entire are where I was working and prevented me from using any other product. Complete waste of money for this use case. Not sure in what way this product would work, but this wasn't it.