Bluestar Flexible Concrete Hairline Crack Filler (Light Gray), DIY - No Special Tools Needed. Fill Small Cracks in Concrete Driveways, Sidewalks and Patios.

I used this to close up some openings on my screened porch, to keep insects out. It is very easy to use, and very effective. Once applied, it retains some flexibility, so no cracking when the temperature changes. Highly recommend.

Their are occasions where you encounter a product where you feel compelled to provide a product review, good or bad. This is one of those products. This product is perfect as described. Those that have provided negative comments either do not understand the product or have an application not suited for this product. It is easy to apply, does just as the description says and is very easy to use. The description says for small cracks. Understand that —small cracks. I highly recommend this product if your need fits the provided description.

A good product, I needed to fill ~1/16 inch crack in New concrete floor. Performed as advertized but required 2 applications to fill crack.

Great product no mixing required! Just squeeze into the crack and level with putty knife as needed. Dries pretty quick so you can paint over the crack as I did. I wanted to paint my cement porch which is rather large black and it was perfect for this project.

This works great at sealing cracks in my patio, but it is much lighter than my concrete. I tried putting some polymeric sand I had on top of it to make it blend in better, but the filler set up so fast it would not stick.

This is not quickcrete, so you should not expect it to act like it. Overall, this is a very good product for what it says it was designed for. NO PRODUCT is going to do a great job across the board for patching concrete cracks, and while it has its pros and cons, I place it above other products I have tried. This pours very well and is easy to use. I wish it was not quite as thick, it beads a little more than I want. As a tip, when you cut the nozzle I would start very small, so you can keep the size of the nozzle hole really small.

Good sofar

Had a crack on my concrete pool deck. It is self-leveling, so be patient as it will initially start to adjust and you will need to add more product into the crack. Yes, it seems silicone based, so not sure if it will survive some of the 100 degree heat in the summer. But so far it works ok. Some did further level out overnight, so you will see a slight dip at one of the ends. I can live with it, so I stained the concrete the following morning.

It was easy to use and worked well for hairline cracks

I’ve been using this for filling cracks in the concrete on my driveway and it is working great so far. It is staying flexible and once cured for a few days it is fairly close to the colour of the existing concrete. Only thing is that I would like a larger container.

Somewhat filled cracks but did not fill deep down in the cracks