Liquid Rubber Waterproof Sealant - Roof & Gutter Coating, Black, 1 Gallon | DIY Leak Repair Coating, Flexible Elastomeric Waterproofing Membrane for Flat & Low-Slope Roofs, Gutters, Concrete, Plywood

We have tried nearly every type of roof caulking out there. The Texas summers on a metal roof are brutal. This and the paint are the only thing that have held up. They flex and still seal where 2 pieces of metal contact where we have had a roof leak for years... no more leak. It set solid in 48 hours. Application was really easy and forgiving. We put on 3 layers of the paint on the tape just to be safe which surprisingly didn't take very much to do. No running or bubbling found. Even after 120 degree Texas days making the roof well over 150... and it still held. No cracking, running.. nothing. It is our go to now. Well worth the money and the only roof sealant that still seems to work. Mineral oil to clean the brush, easy to apply - just like a thick paint. Dries in 24-48 hours. 3 layers with the tape was enough to handle 7 inches of rain in 3 hours no leaks this spring. Thank you for making this and please keep selling it!

Works as advertised. I will buy it again.

My project that I used this on is over three years old. There is slight cracking under full sun but otherwise it has held up well. It deals with constant watering and has adhered well to my project. It wasnt hard to apply with a big brush but it does start to harden quickly. I still have some leftover because it spread so easily as is.

We used it to fix a part of the basement outside wall. We had to do a few steps before but this was the final set. It didn't have a strong smell, it was very thick and had brown appearance, once dried it turned black. It was easy to use, not messy at all. I used a lot to make a very thick coverage and until this day it seem to have worked.

Haven’t used yet, but it’s great for seal the roof!!

Easy to apply. CLEAN, CLEAN CLEAN!

I put 3 coats of this on my old Costco fiberglass fountain, that I bought 26 yrs ago after it began leaking last year pretty badly from cracks. It sure looks gorgeous now, keeping my fingers crossed it did the trick. I will update as time goes by. So here's my update, August 7th 2026. This stuff turns a weird burn color in the bottom of my fountain. As the fountain is going, it causes a foam, I wonder if it is toxic to my birds, because they drink out of the fountain?!

I have an older 12 x 18 foot gambrel roof storage shed used for lawn mowers, tools, etc. There is no telling how old the shed is since it was here when we bought our place 15 years ago. A friend of mine said he'd never even seen roof tiles like were on my shed. Over the years I've lost a couple of tiles, the tiles were getting very worn and you could close the doors and see light coming through the roof. Needless to say, rain water was not my shed's friend. Thought about replacing the roof but the cost was way out of reason for a shed. Found this product and after reading the many reviews I though I'd give it a try. I replaced 2 roofing tiles and started coating the roof. I put 3 coats on the rood, a little less than 3 gallons. This stuff is amazing. I would have never believed it, but my roof is completely sealed. I can't even lift or separate the tiles now. There is no light penetration and we've just had 4 days of constant rain and there is no leaking. It does go on brown in color but soon changes to black. The first coat took a little longer but after that the second and third coats just went right on. I managed to get a lot on my hands but it washed off with soap and water. I had about 1/3 gallon left and since there is no way you can reseal the container I decided to coat the wood on my trailer. Can't say if that was a good idea or not but figured it couldn't hurt. For less than $200 I got a completely sealed roof that I expect will last many years. If not, I'll just get another gallon in a few years and re-coat it. I highly recommend this product. Read all the reviews to insure it will serve your purpose, but I am very thankful I found it.

Good quality

It kept out the rain

Perfect for my Needs!

It is a relatively convenient waterproofing system, which stops water penetration dead. Painting it on can be messy. We found you really need turps [mineral turpentine] to clean up brushes and spills even though it claims to be water-based. Don't use your best paintbrush for this material - once used for this you wouldn't be able to use the paintbrush for regular painting jobs after. It dried within a day (strong sunshine, 30-35 degrees C/85+ Fahrenheit). I reckon at a more civilised temperature, it would take 2 days. It works well when you've got good access, provided you clean the surface, but there were a couple of situations where access was very tight and we couldn't clean/prepare the surface properly. This sealant has high viscosity, meaning it doesn't stick onto the surface if it's dusty or when we're poking the paintbrush in at a funny angle. It's not proper procedure, but we thinned it down about 50% with turps to overcome these problems, to get the first coat on. Second coat was then easier.

Bought with the geo-textile membrane and both really worked! The conservatory adjoining my bungalow had always leaked at both ends of the guttering and repair by a professional hadn't solved the problem. I thought I'd have a go when I came across this product at the end of August. I applied two coats, 24 hrs apart, and would have applied a third, but the weather changed and we had a deluge. Result: absolutely no leaking and a wonderfully dry conservatory - I couldn't believe it! Now November and still dry. NB: This stuff is easy to apply by a complete amateur (me!), but you need to be really thorough and seal absolutely every possible angle where the water might get through, laying the geo-textile membrane right up to the edge of the guttering, as huge amounts of water come off the roof. Can't rate this stuff highly enough!!