Geocel 4500 Roof Bonding Sealant, 10 fl oz, Black

⭐️⭐️⭐️⭐️⭐️ The Gold Standard for Roof Repairs—Worth Every Penny!​I bought the GEOCEL GC55103 4500 Roof Bonding to finally tackle a persistent, slow leak around a chimney flashing that I had failed to fix with three different big-box store sealants. This product is in a league of its own, and the five-star rating is absolutely earned.​Application: The sealant is thick, but it flows exactly where you need it to go. I applied it easily using a standard caulking gun. The self-leveling property is fantastic; it beautifully filled small voids and gaps around the flashing without me having to tool it much. It adheres immediately to everything—metal, asphalt shingle, and masonry.​Performance & Cure: I applied this on a cool afternoon, and it skinned over quickly. The truly amazing part is its performance. The leak I've been fighting for months? Completely gone after the first rain. It remains flexible and has handled the recent temperature fluctuations and strong UV exposure with zero sign of cracking, shrinking, or lifting. It truly creates a permanent, watertight membrane.​Final Verdict: If you are dealing with a tough leak on your roof (especially around vents, skylights, or flashings), stop wasting money on cheap sealants. The GEOCEL 4500 is professional-grade and provides the peace of mind that the job is done right. It bonds fiercely and forms a flexible, durable repair that looks like it will last longer than the roof itself. Highly, highly recommended for serious DIYers and professionals alike!

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.

This stuff is amazing. I used it to seal roof nails and the seal the flashing. Dries quickly (can actually be used when it’s raining) and sealed everything up. Then I went camping and my RV had a leak. I remembered I had this in my truck. I put it on the spot I suspected was leaking in the pouring rain. The leak stopped immediately. I’m sold! Best stuff ever.

This stuff worked great on my roof project. After 25 years the rubber seals which waterproof the plumbing vent pipes where cracking. It was very easy to seal with the geocel roof bonding sealant.

Overly drippy. Makes a mess. Definitely don’t use on anything remotely vertical

Works great. Shingle that had torn off in the wind is now solid.

Great stuff. Wear latex gloves and be advised that WD40 will help clean messes.

I've used many different sealants and this is the best by far. The consistency is a little thicker than most, but smooth. It's very trowelable and fills voids well. Setting time is a little on the fast side which is preferable in most cases. It cures to a very solid yet semi-flexible mass that reminds me of the better rubber creating products. Adhesion is strong on a wide range of surfaces. Geocell should consider offering it in a 64 oz tub for use in troweling setting beds for flashing work. Add the ability to use it under water and you have sealant paradise!

Exellent product for our purpose