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Model # 427706

Internet # 203249445

Store SKU # 652010

10 fl. oz. Crack Sealant

This item has been discontinued.
The Home Depot no longer carries this specific product.

$7.48 /each
  • Gradually self levels into crack for a flexible finish
  • Textured to blend with concrete surface
  • Permanently water immersible after cure




Model # 427706

Internet # 203249445

Store SKU # 652010

Sikaflex Crack Flex Sealant is a one part, polyurethane sealant for permanently repairing cracks in horizontal concrete surfaces. It can be used in cracks up to one inch wide and provides long term durability. Its elastic technology formulation allows the sealant to remain flexible and move with the crack.

California residents: see  Proposition 65 information

  • Gradually self levels in the crack
  • Water immersible after cure
  • Forms a permanent watertight seal
  • Textured for added density

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Color Family 
Drying Time (hours) 
Product Type 
Product Weight (lb.) 
1 lb 
Warranty / Certifications
Manufacturer Warranty 
One year from date of installation. 


Rated 4.6 out of 5 by 20 reviewers.
Rated 4.0 out of 5.0 by fixed my crack I had a big nasty crack in my concrete driveway, I used this product to fill the gap. The directions say to just put it down on the crack with a caulking gun and let it sit. It is self leveling. After the fact I kind wish I would have used a putty knife on it to level it out. It kind has a little pump where the crack was. Look at my pictures and you can see what I am talking about. It seems durable though, and I don't expect it to fall off or anything. All I did for prep was sweep the cracked part of the driveway with a broom. September 25, 2013
Rated 5.0 out of 5.0 by Best In Class - Have Used Sika for 5 Years I've been using this product for over 5 years to seal driveway cracks and it dispenses and holds up much better than 2 similar products I have tried. The competing products are harder to pump out of their cartridges (which is important if you are using a lot of tubes) and they do not have the flexibility and long-term elasticity of the Sika sealant. Be sure when you use this that you first fill the crack with a pre-filler (my favorite is limestone base because it compacts) else you'll waste the sealant down the crevice of the crack, which is expensive. Also, if you live in a cold climate, never let the sealant fill above the level of the concrete, else your snow shoveling equipment will snag it and pull it out. June 4, 2013
Rated 5.0 out of 5.0 by concrete crack/joint caulk This stuff works to seal the gaps which allow water into your slab joints. Which freezes and buckles and cracks the concrete slab. If the crack is deep you'll need to put filler into the crack first. HD has special closed cell foam strips made for this in several sizes which cut with scissors easily to stuff into those cracks so you only fill an area about 1/2x1" to conserve the sealer. I use a wood paint stirrer stick to stuff the crack. This stuff stays runny(self-leveling)for several hours. It will keep disapearing down that gap unless its partially filled first. It may take a couple of days to cure to its tough rubbery texture. You must cover it up with something to avoid walking on or driving over during full cure. I found that wide painters tape worked for me. This is difficult to get off your hands and everything it touches. Be neat and careful, wear gloves. Suitable solvents are pretty harsh on skin like xylene, acetone, fingernail polish remover, etc. Soap and water doesn't do to much. Once cured this stuff is stuck to whatever it's on about as tough as tire rubber. It's elastic and will move with the crack to a limited extent. I had an area of several inches let loose on one side. I cut out as much as I could with a box cutter and filled it back up with the Sikaflex. A very effective product which works. Comes in small 10.1oz caulk tubes and mega 29oz tubes. April 29, 2013
Rated 5.0 out of 5.0 by Good Crack Filler I used this product on some horizontal floor cracks in my poured concrete basement floor. The cracks were all less that a quarter of an inch so although the product advertises use in applications up to one-inch cracks, my job was a bit simpler. It went on very easily and set up fairly quickly. I let it dry overnight and no issues the next day. The instructions say it is tack-free in one to two hours and cures in three to five days, but in view of my narrower crack size it seemed to set up more quickly. Plan ahead in using this because the instructions indicate it should be used in one day. It is not a product you would open once and store for later use as well, as you might with a silicone caulk tube. This Is the same cartridge style that you would see for caulking but it is definitely different material specifically designed for concrete applications. It has been in place weeks now with no issues. I would highly recommend it for horizontal crack applications December 7, 2013
Rated 5.0 out of 5.0 by Did the job better I have had issues with basement wall water leaks from all of the rain we've had in GA this summer. I used this product to seal a few porous or cracked concrete wall areas of my basement after trying other polyurethane crack sealers without the sand. It worked well and looks good. This product runs less and looks better than the others without the sand in this application. I also used it for another basement project, sealing the joints where basement walls meet the floors for radon mitigation. September 16, 2013
Rated 3.0 out of 5.0 by OK but tedious with caulk gun This product performs as advertised. My only complaint is using a caulk gun can make this job slower than it should be job. I used it for expansion joints and it was difficult to do a professional looking job because of the nature of using a caulk gun (unless you use one regularly). I went though 2 tubes of this product before I stumbled across another brand that comes in a 32 oz plastic container. You squeeze it out like wood glue. I simply found the 32 oz container much easier and quicker. It also leveled out quicker than what came in the caulk tube. You may be perfectly fine with using a caulk gun, but I preferred the plastic container with the resealable cap.. It was also much cheaper. March 30, 2014
Rated 4.0 out of 5.0 by Not So Long-Term I use this product to fill the "not-so-hairline" cracks developing in my exposed aggregate driveway. The best feature is its 'self-leveling' attribute ... squeeze it not-too-carefully along the crack and don't mess with it. It 'levels' so well, you'll probably need to go back over the cracks in a day or two. Needs improvement areas: the 'sand' color is too bright for exposed aggregate; its 'plasticity' lasts only a few years after which the normal expansion and contraction on the aggregate will crack the seal and you'll need to reapply. But I haven't yet found a better product. November 13, 2013
Rated 5.0 out of 5.0 by Went to buy more... I will be purchasing quite a few more tubes of this when I can find it. Self leveling worked very well. Finish looked good against the existing concrete. After curing, it still remained flexible enough that I don't see any issues with keeping water out of the cracks for winter freeze. You will want to get closed cell foam for packing into larger cracks. I specifically did not pack foam all the way to the edge, and let the sealant flow down as far as possible. I was only able to seal the edges with the amount I had, so I could test water intrusion from the edge of the crack using a hose. By flowing down fully, there was no water coming in to the center of the crack, even with a decent pool in the dirt next to the concrete. This gave me confidence that the water will stay out and not freeze heave this crack even larger. I'm part of a review group that is given some products to testing and evaluation. Some of these products may not yet be carried in the Home Depot stores. Here is all I really need to say about this product: When I used up the tube given, I was sad that the local Home Depot did not carry this. I needed to finish my sealing jobs and tried all products for crack filling in the store and this is far superior to all others I tried. June 12, 2013
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