Foundation Sealant - Basement Waterproof Sealer, Black, 5 Gal | Flexible Elastomeric Coating - Crack Filler, Leak Repair, Basement Waterproofing Solution, Indoor/Outdoor Use, DIY Protection

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.

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.

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 sealant is easy to apply and cleans up with water. But once cured, it takes a solvent to remove. It adheres very nicely and applies thicker than some comparable products. It can be walked on in about 8 hours, but remains tacky after curing like similar products. So any sawdust or other dirt will stick to the sealant, so be sure you keep the finished area free from that. This great thing about this product is that it is not only a water sealant, it is also an excellent MOISTURE barrier which is very important if you are trying to keep a space free from mold and other moisture damage. It also is elastic which comes in handy when you have cracks in your concrete floor or foundation wall. (I have had problems with Drylock developing cracks.)

Work great

Try to be home when it's delivered because shipping company will leave damaged product at your door with a piece of plastic over it. Did not think to take pictures before I tried to salvage the rest of product. Great product what I received anyway

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.

Have to wait and see but did area it said and was easy to apply.

I like this product!! , I brushed it on as thick as i could, used the paint brush and scooped it out then put it on as thick as I could without causing runs. That said.... Im still going to put on blueskin membrane, I don’t think this is a substitute but a good base and instead of the recommended primer. it would need multiple coats like the can tells you to ensure its sealed if this is your only source, I don’t have time for that. There is a lot of small air bubbles but might be because of the thick coat ...i’m not worried because like I said I will also use the membrane. This was enjoyable to apply and all I could think of was chocolate pudding, It goes on brown then dries black, its has the thickness of pudding or mayo, and covers extremely well ! was a good price compared to other options and used aprx half the pail to do aprx 200sq ft, and its a THICK single coat, multi coats are recommended. I will definitely buy this again and from the same supplier. I received it extremely fast ! I think it was 2 days. I tried to roll it and it works fine but too thin for my liking and would recommend fluffy roller because the pits in concrete would not fill in. As for spray application I don’t see how that happening... It also dries nicely and quick enough ! I din’t notice any odour either . I’m looking forward to having another project I can use the rest on, and buying another pail is highly likely! So depends on your project I would say Try this out,

8 Months now and still sealing, would recommend

Easy to apply, it has consistency of yogurt, so it goes on a vertical surface such as a basement wall no issues at all. I applied three coats over top of 40 year old damp proofing, no problem. Sticks to anything really well. NOT a tar based product, dried much faster than tar and I did not find the odor particularly strong. Barely tacky within a few hours, I let it try a few days because I was applying rigid foam over top of the liquid rubber, on the exterior of a foundation wall. But you could probably get away with applying rigid foam over top after 24 hours, if that's your application. As a test, I applied some liquid rubber directly to some scrap expanded polystyrene and it did not seem to react. But I would still avoid contact with non cured product just be be safe.