SIKASikaflex Crack Flex Sealant, Gray, High-Performance Textured Polyurethane, Self-Leveling, Waterproof Sealant for Horizontal Cracks Up to 1 in Wide, 10.1 fl oz,

Love this stuff!! Excellent seal to keep moisture out. Easy to apply and self leveling.

This stuff is amazing and absolutely delivers on it's promises! I originally completed this project using the horrible Dap version of concrete filler/seal which was horrible to work with and NEVER set (even after 2 dry 70 degree days) and essentially washed away on 1st rain. I completed the project again with this Sikaflex and it worked perfectly. It completely self levels and fills in the void. The best advice I have is DON'T touch it. Just lay your bead and let it work it's magic. It completely levels and leaves a smooth finish. Then come back and re-fill any voids that may appear. I had used sand then backer rod so I only had one corner spot that needed a little extra fill. I also sprinkle a little of the sand on the still wet seal to add to the concrete look though this Sikaflex already has a nice texture. This stuff has a great look on it's own and I'm so impressed with how well it works and looks. It's now cured and firm, yet pliable to the touch. I should have used this stuff in the first place.

Used on the 1/4 inch control joints on my stamped concrete patio. It did self level fairly well. Steps used:1) Cleaned 2) placed 3/8 backer rod placed in gaps leaving about 1/4 inch to fill. 3) taped off joints to prevent overflow mess 4) applied caulk to top and let it self level- used putty knife to smooth out high spots 5) removed tape after about 10 minutes while still wet 6) While it was still tacky, I dusted with a mixture of sand and charcoal release I had used for stamping the patio. Did this to try and match my stamped patio as best as possible. The gray caulk would’ve stood out like a sore thumb. 7) Blew off excess dust and let totally dry.Pretty happy with it. Took a star off because thought it would level better. Overall nice product. 1 tube just filled my two 11’ by 1/4 inch cracks.Pics attached showing start to finish

Best concrete crack filler on the market! I had a professional concrete repair crew lift my driveway a few inches after water washed away the dirt underneath it. They repaired the cracks using this sealer and guaranteed it for 5–years. It expanded and contracted with the weather and provides excellent adhesion to the concrete. So I had sidewalks with cracks and I ordered this to fill them. It’s miraculous stuff. It blends well with the concrete and looks professional. It’s self leveling which provides a smooth finish.

Worked great! Dries quickly! Not messy!

I applied 10 tubes of this to cracks in a concrete driveway on a warm day, and was pleased with the ease of use and its self-leveling qualities. As others have said, it will sink into deep cracks and isn't inexpensive, so keep that in mind. I happened to have one tube each of similar products, so was able to compare all three in the same situation- this product was clearly the best of the three. My application was recent, so I can't speak to long term durability. Bottom line us I'm glad I spent a little more for a product that so far has been everything it promised to be.

I have used this the past 3 years to fill a small gap between where my front porch brick steps meet the concrete sidewalk. The caulk cracked much more than I expected every winter, and I have had to re-caulk every spring. I live in the Mid-Atlantic region of the U.S. and our winters are not real harsh like they are in some of the northern states.

I have a gap about 1" wide between my garage apron and the concrete slab adjacent to it. It looked like it had been filled with something black, maybe tar and it broke up when I ran compressed air over it to clean it up. Certainly not flexible material at this point and already had cracks in it.I had read about this type of "self-leveling" product (which has been used elsewhere in my neighborhood) and decided to give it a try. Although I had some backing, I wasn't calculate how much I would need, so I started with 3 tubes. That got me about 2/3 of the way across the apron - a little better than expected. Not bad for a 1" gap. (Also the slab is tipped 1/2" - 3/4" relative to the apron across it's width so that the edges cross in the middle; water will have to follow the gap ~ halfway to flow onto the slab.)I went to order a couple tubes to finish and in a couple of weeks the price had doubled from $10/tube. Turns out the local Home Depot carries it for around $10.I hadn't worked with this self-leveling product before and it really does flow even more easily than I expected which means your prep has to be pretty good. Although it says it can be "tooled", I had minimal success with that (after 20-30 minutes) - maybe if you work it immediately. I found I had to lay a little less than I thought was needed and go back over it a few minutes to get the level I wanted. There is a little "knack" to using it well, but I got it after using 3 tubes,One thing I did find which is illustarted in the image, when I went back a day later to continue filling the gap, the new material didn't quite blend seamlessly with the day-old material. (See red arrow, and dashed line which traces part of the "seam".) The image exagerates it a bit, but as a perfectionist I notice it. The difefference in height is like 1/16" ... not much frankly. Overall it looks real good to me given the alignment issues.Been in place a few weeks. Interested to see how it fairs over the Western Pennsylvania Winter.