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

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.

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.

Smooth way of applying. But instructions are to scrape off excess. If you do it right away it smears instead of staying only within the crack. If you wait too long it dries and is rubbery. Trying to get the excess off and even with the top of the crack it often pulls all the product out of sections of the crack. Then you need to redo those sections.That said it is the best product I’ve used to seal patio cracks for installing. I look forward to seeing how well it wears and lasts.

I'm very happy with this product. I used it to repair a hairline crack in a new driveway. The color match is very close and looks better than the crack. Now, I'm not worried about water freezing in the crack and making it worse.

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.

Crack was deep in some areas mainly to left side as illustrated in photo, so applied in coats over three days as settlement occurred. The color light gray matched what I call reasonable. Too early, since final coat was applied 4 days ago, how long it will hold up and the end color, to ascertain. Oct 16, 2023

Does a very good job on the cracks on the sidewalk and driveway I used the product on

I used this to fill hairline cracks on my front and back porches. I applied this in the summer of 2024 and it's still holding up. It's not the same color as the rest of the porch, but the crack is filled.