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.

It was easy to use and worked well for hairline cracks

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.

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.

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.