Bluestar Flexible Concrete Crack Filler (Gray), DIY - No Special Tools Needed, Fill Cracks in Concrete Driveways, Sidewalks, Patios, Garage and Basement Floors. 16 fl. oz. Bottle.

Unlike other products that I've used to repair cracks in my concrete in the past, this product not only works, it is flexible, it is waterproof, and it is possible to layer it over a 3-4 or 5-day period depending on the depth of the crack and the width of the crack but it really works and it is easy to apply. My only warning to the installer is protect the repair line from feet until the product dries fully because someone can leave footprints in the surrounding concrete if they walk on it too early. I stepped away for 1 minute to get a tool and a FedEx driver walked on mine and left Footprints up to my front door.

Works OK, but a poor color match to my concrete. I used some bits of the old concrete on top for a partial match. Clear might be better than white or random gray. Difficult to fill into small cracks under 1/8", but OK for larger cracks.

Filled the cracks as expected and although it does run a bit on vertical cracks it is easy to work with. Dies quickly again as advertised.

This is an interesting product. It seems to be basically a kind of liquid rubber with some sand added. Consistency is very good. It's thick enough that it doesn't flow away into the crack, but thin enough to spread the width of the crack without much coaxing. Cleanup is easy with water. To apply, I used an industrial syringe to inject it into the crack. The result was tidy with very little waste. So, why only three stars? Well, for one thing, the product was supposed to come in two colors, gray and light gray. I bought both and after squeezing out a sample of each on a corner of the driveway to see which was the better color match with the concrete, I couldn't tell them apart! Also, in the six months since I applied this product, some of it has come out of the cracks, I think because it did not adhere very strongly to begin with. I'll have to re-do these places. Hopefully most of the filler will stay put and I won't have to re-do all of it, but that remains to be seen. Also, after a year the material itself shows cracks (kind of ironic), although they don't seem harmful yet.

I like the fact that this dries so it can expand and contract if the crack decides to move. I took an air compressor with a small blower attachment and blew the crack out. I then cut the tip of the applicator and squeezed it in. Some of the areas of the crack were a lot deeper so I had to put more in where holes would appear. I actually had to do this several times and then FINALLY figured out that this works better if you squeeze it in to the crack and you drag the tip along the crack. This forces the patch in to the crack. You can wait about 15-20 minutes before taking a putty knife and flatten it down.

This liquid cement is awesome, very easy to use and does the job of filling those cracks in cement, I had a special between the door and the molding and water was coming thru there, poor some of this liquid stuff and stopped the water from coming in, I highly recommend it.

If you have small cracks this will work fine, but I'm not sure about larger ones. If the cracks are deep you will need to push some foam strips into it otherwise it will keep settling into the crack leaving holes that you need to keep filling. I ended up using this to fill the 1/8th to 1/4 inch gaps due to the rubber filler deteriorating in front of the basement door, garage doors, and basement floor because they matched the concrete color. But ended up purchasing a different product (that was black) I found locally to fill the gaps between the concrete and a brick wall that was about 1/2inch wide and deep. This product would have cost me several hundred dollars vs $90 for a 5-gallon bucket. This product took about a day to skim over and several to fully rubberize, make sure you have several days of no rain, and make sure the area is clean and dry, it did what it was supposed to.

Applied the dark gray version to hairline cracks in the concrete decking surrounding in-ground pool. Was concerned that the consistency would be gunky and would have to push it into crack with a putty knife, but it is liquidy enough to easily penetrate even hairline cracks. After 24 hour curing period applied concrete stain...not a 100% color match but good enough to where you can't see the repair unless you are looking directly at it from a few feet directly above. Great product.