What product for small cracks

[tomsop]

I have tried off the shelf concrete patch and repair products - they seem to be too thick. I tried self leveler underlayment powder and wet it with water and that seemed to work but crack still visible. You will see in the images that after the product I used had settled the crack re-appeared. I have about 50 lineal ft worth of these cracks in various places on my garage floor.

 

[Sumboodie]

You'd need a highly viscous product. Several available in squeezy bottles. The box stores carry a few flavors and there's some available online. No idea if one is better than another though.
You could grind the cracks wider, but IMO, why make it any bigger than it already is?!

 

[Armorpoxy]

Armorpoxy carries an excellent Epoxy Crack Filler that mixes up like Bondo and you putty knife it into the cracks. You can then grinde it down smooth. Deep cracks should be cleaned out and filled with sand or backer foam to support the product from sagging but you can apply it multiple times if needed.

Crack Repair Epoxy Putty - 2 Part

ArmorPoxy Crack Repair Putty: Strong, easy-to-use 2-part epoxy for filling cracks up to 3/16" deep. Paintable immediately. 500-2000 lineal feet coverage.

armorpoxy.com

 

[elijahisaac]

I'm not sure about this, but Bluestar Flexible Concrete Crack Filler works best for thin cracks, and Red Devil 0644 Pre-Mixed Concrete Patch works best for large cracks, in my experience.

 

[Smittybert]

Need a epoxy concrete repair I used Hyper Cure https://floorguardproducts.com/concrete-repair/
https://floorguardproducts.com/concrete-repair/
It seamed to work well and sanded well after cured but will see how it holds up.

 

[MerlinsBeard]

I'm a fan of slabweld from bestmaterials from repairing several long basement slab cracks and a garage crack. It uses sand as a base and the slabweld locks it together. A couple years later, the crack exposed outside of the garage door has started to show signs of degradation, so may not be best for outdoor repairs exposed to moisture. No new basement slab cracks have appeared, and the internal repairs still look great after a couple of years.

I recommend an extra pair of hands since it sets pretty quick. I chased the cracks with a chisel first to remove any loose concrete, then vacuumed up the dust and material. Have one person for filling cracks with sand, the other to apply the slabweld (wear gloves, it does not come off easy). Try to do it all in one session. Wait for it to cure and angle grinder the excess material off.

 

[BombShelter]

The problem is unless you stabilize the crack anything you put in it will also crack. I was just taking photos yesterday of a vertical epoxy repair on a poured wall. After one year it developed a crack in the brittle epoxy.

Fortress brought this product to market a few years ago, I don't think there's long-term examples yet but their other carbon fiber products, used with epoxy, have been really good.

Those are pretty big cracks, I'm wondering what your gutter system looks like, I have a feeling no gutters and your support base is getting washed away leaving voids under the floor.

 

[LegacyIndustrial]

Our XtremeSet100 is used extensively in the Pro-Installation market and has found a home with DIY as well.
Check it out and good-luck.