Liquid Rubber Basement and Foundation Repair Sealant - Waterproof Concrete Sealer & Crack Filler - Flexible Coating for Indoor & Outdoor Use - Waterproofing Paint - Black, 5 Gallon

A superior product. Goes on easily and drys fast. It cures into a rubber-tar based coat. I advise 2 coats. On corners, use the gause for added strength. This product was like painting Bitumen on the walls. Underground, this will last a hundred years and there's no way water will pass through a properly prepped wall! Color is black and fills voids, although a parge and repair should be used first then some gauze if theres a structural repare thats called for. When I purchased this, it was quite expensive. The price has come down since my purchase thus making it a better deal. Btw, thise using Blackjack, blackjack isn't in the same league! Wish I took some pics or did a video, just take my word on it as this was far from my first rodeo.

I live in a 100 year old house and had experienced flooding in a ground level room. Apparently this had been going on for some time but previous owners didn't mention it. After getting quotes of up to $12k to excavate and repair the foundation (below grade) I decided to give it a try. After researching the internet I found this sealant and purchased the 5 gallon size. Next step was to excavate 25 ft long, about 18 inches deep, around where I thought the leak was occurring. I found several cracks and deteriorated concrete that I patched. Last step was to apply 4 coats of the foundation sealant using a concrete brush. Instructions say you can roll it on but it just seemed too thick so I went with the brush. My coats were probably thinner than what the instructions recommended but it looked really thick when I was applying it. Each coat dried in about 24 hours. You can tell when it's cured by the color change and it being dry to the touch. After the 4 coats, I back-filled the trench and waited for the rain. It's been 4 months and we've had several heavy rains with no leaks. So I'm calling it a success at this time. I ended up spending about $250 in materials so I'm glad I didn't contract this out. Maybe 30 man-hours to trench, patch, coat, and back-fill. I'm in my 60's so others may be quicker. Some noteworthy comments: I only used a couple of gallons when I had estimated I needed almost 4. Maybe my coats were thinner than they should be but appears to have been effective regardless; I used concrete brushes at about $10 a brush. I tried to clean the first one but this stuff is like a thick tar and wasn't worth the effort. I hate to put unnecessary stuff in the landfill but cleaning was just too difficult. I've got another area I may address similarly so I'm hoping the sealant will last a while after opening. Will probably be Fall project. Overall, a very good product, easy to apply and work with, and appears to have addressed my leak issues.

Really nice sealant just wish it did not have such a high shine. If you prep the surface well, it goes on easily and seems to have very high adhesion. Worked quite well and now I will just need to wait and see how it holds up.

Considering the cost, the actual high quality of the product and the "relative" ease of application to exterior and interior walls; I believe this to be one of the BEST products on the marketplace! I am a retired licensed civil and mechanical engineer and in my late 60's, so I know and appreciate a good quality product when I see and use one!. I can afford to have someone else do my odd jobs or even quasi-major ones like basement waterproofing. However, I'm retired with too much time on my hands and this "waterproofing" job needed to be done so, in the interests of brevity here goes. First off, apply this stuff to clean (scraped, sanded, or repatched holes in basement walls be they cinderblock or fieldstone) surfaces. In my case I had to scrape out the old lime based cement used in-between the fieldstone foundation of my community walled 120 year old, Brooklyn Brownstone, rowhouse because after so many years it just disintegrated, allowing moisture and water invasion. I plugged up the joints holes with hydraulic cement (relatively inexpensive, even on this site OR from a big box) let them dry because hydraulic cement dries so fast tyou can only use very small batches at a time. I did not say this was fast work, however it ain't rocket science either so all you need is time and patience. Though I did not need to do so, I covered my interior basement walls with Sakcrete "topping or patching" cement which is premixed and applies easily AND has a long work time to batch size ratio. I felt that the Liquid rubber foundation sealant product would have better "purchace" or attach better to the coated rock schist surface. That being said, after all surfaces were prepared it was a simple matter of applying (in my case with a whitewash brush but on flat surfaces such as a cement block wall, a roller with a medium "nap" will work fine) the material. I would recommend applying between 60 to 80 degrees F. for best, even drying times but of course humidity will be a factor. This product dries medium "tacky" so I would allow a few extra days drying time if that's within your work time frame and IF you intend to paint over the rubber material which is black. There is no reason NOT to,leave it black but I find a white or light color helps with light dissemination and seems a little more pleasant to look at. Essentially, those are the instructions on the can but if you go to their website (also on the can and on Amazon's product webpage description) you can find more info on applications/ coatings, etc.! I highly recommend this stuff, I've used many other brands in similar situations including the funny looking and sounding guy on TV in his "flexibly sealed rubber coated screen boat," and I find this material not only more effective but MUCH less expensive by far whilst being a far superior product to use.

This product works very well. Just apply 2 coats if coating cinderblock. We did our basement, put up insulation board then drywall. What a difference in temp and air quality. Provides a nice rubber like moisture barrier. It's cost more than dry-lok but well worth it so I don't have to worry what's going on behind the drywall

I bought a house last year and when it rained I sometimes smelled damp not always but sometimes depending on the direction of the rain. I am a woman and this is my first house so I felt confused as the house didn't appear flooded. I came across this product and I painted it around the foundations of the house on the exterior, where was previously sealant that was in poor condition dry and peeling off. After I painted it the next day I woke up and went to have a look. On the side of my house was suddenly a large pool of water because it rained and I realised that this water which I never noticed before was probably going under my house and that is what I smelled. I had no clue there was a hole but applying this foundation made me realise it. Also it is evident it works very well since it didn't let through the rain under my house but kept it outside. Also I no longer smell the damp smell after rain.

This stuff is incredible. Jet black, super thick, but easy to brush or roll on my cement walls to help limit moisture intrusion. I am extremely pleased with this product and would not hesitate to purchase it again. Only issue I have, is the calculations for how much you need - it seems to be very out of whack to me. I sealed only 2 of my basement walls and according to their calculations I needed 2 full buckets. Well, I put 2 coats on EXTREMELY THICK, and I never even touched the 2nd bucket ! This stuff works and goes a real long way, trust me.

This Sealer is fantastic---easy to apply with a brush or roller, NO LINGERING ODORS; no question it is a rubber base; dries 100% in 2 days [depending on temperature of course]. The concrete sub-floor in my crawl space was poorly done by a contractor. Two corners were not completely filled with concrete which caused leaks in the Spring thaw for the last two years. As well all the side corners were not properly sealed. So I have had flooding for the last 2 years come April thaw. So after finishing some concrete work in two corners etc. I applied 3 heavy coats all around the corners in the sub-floor. I am so happy, no more leaks. So if you have water problem in your crawl space, buy this product, you will be glad you did. There is another sealer that I bought at Rona used in sealing concrete. I used this for sealing the floor---and it did very nicely. The big problem with this sealer was it is petroleum based, so the odor from this was horrible. The smell lasted for 4 days and is still not 100% dry after 2 weeks. It probably would be okay if you did this in the heat of the summer where it would dry faster. I think this product is best used outside.

It’s easy to apply and drying quickly so generally good stuff 👍

Bought this product to seal the lower section of the walls in the garage. used it on the outside first, went on easy as advertised. Applied it to the inside walls, so far it is working. Next spring will be the big test, will update review at that time. Only problem I had was on the packaging. It has a label noting HEAVY ITEM, but not THIS SIDE UP. Driver put the package upside down. Good job the lid was secure.