Dap 18021 Concrete and Mortar Watertight Filler and Sealant - Gray 10.1-oz Cartridge (18096). Sold as 3 Pack

I used this to prevent driveway water from getting in the basement. Works pretty good. Shelf life is short. Use a thick spread.

I found this product to be fine and I did not have the problems some of the the other reviewers had. From some of their pictures, I am pretty sure they did not follow directions or understand how this product need to be used in order to work. If the crack is deep and large, you need to fill it. I went off book and just used some rocks/ gravel I had, but the suggest you use some foam rodding. You simple cut it and stick it in the whole while allowing you to overlay it as evenly as you can with the paste. If you try to fill in too big a whole it is going to shrink and possible crack. If this happens I would just addition application, but I am not and expert and I should someone can Google what is best to do. I do have some cons with this product when using it on horizontal; I like use self leveling kind in driveways and sidewalks a lot better. You do not have to try to soomth it out like I did with the paste. This would work wonderfully vertical surfaces because once applied it sticks to the surface. A reminder it is better to clean the surface you are applying it to, so it steaks to concrete and not dirty. All in all, I would recommend this product and if you want more direction on how to use it, just Google it because there are a lot of videos out there.

Dap 18021 Concrete and Mortar Watertight Filler and Sealant is an essential product for anyone looking to repair or seal cracks in concrete, mortar, or masonry surfaces. Ideal for both professional contractors and DIY enthusiasts, it’s designed to provide a durable, watertight seal that helps prevent water damage and prolong the life of structures. This filler and sealant stands out for its strong adhesion and flexibility, which means it can handle slight movements without cracking or losing its seal. It’s easy to apply, even in tight or hard-to-reach areas, and it cures to a tough, weather-resistant finish that holds up well against outdoor elements. Many users appreciate how it fills gaps smoothly and remains paintable, allowing for a clean, finished look. Overall, the Dap 18021 Concrete and Mortar Watertight Filler and Sealant impresses as a reliable, high-quality solution for sealing and protecting concrete and masonry surfaces. Whether you’re addressing cracks, joints, or other openings, this product offers peace of mind with its lasting watertight performance. It’s a practical choice that combines ease of use with effective results, making it a worthwhile addition to any repair toolkit.

Great stuff

Worked for about a year then the cracks came back.