How To Repair Cracks In Concrete

About This Project

Imperfections in concrete can be pretty ugly. So it’s important to know how to repair cracks in concrete.


The good news is that this is a pretty easy process to do, as long as you follow along.


Please note: In the first video above, we use quick mender, but we have since upgraded to our Instant Medic Concrete Repair which has the same effect but is easier to use. We show the mixing process in the second video.


How To Repair Cracks In Concrete


The most tricky part of this entire process is going to be applying the instant medic quick enough so it doesn’t get hard within the cup. Really, it’s that easy to use otherwise.


(It’s so easy to use in fact, we have a 7 year old mixing it in the 2nd video).




To prep, you are going to use a wire wheel and go through the crack to scrape out all those little extra pieces that are in it. Then use a shop

Instant Medic Flex Display

Instant Medic Flex Display

vac and vacuum up the dust and dirt. This is going to make the effect of the instant medic far more effective.


Now when mixing, you are going to mix 1 to 1 (one to one) equal parts between side A and Side B (see picture to the right if you’re confused). Really what we are dealing with here is basic chemistry, and if you can remember from Chemistry lab in High School, incorrect mixtures can lead to…well, incorrect results!


So don’t take any risks. We get people all the time who call in and say they didn’t get the result they wanted on a project. We ask how they mixed the product, and they respond with 3:1, 6:1, 10:1, you name it. By the time it’s mixed like that, it’s too late.


Now you can dye this with pigments, sand or concrete, really whatever it is you want it to look like. You can also use sand to keep it from soaking too much.




Now to apply, just pour the product into the crack. It’s going to soak down into the crack itself, which is what makes this product so easy to use.


Here is where you can apply sand as well if you think it is soaking in too much. You can also add in some more pigments and dyes to make it the color you want.


This is the point where you have the option to work with the product a little bit. In addition to adding pigments and dyes, you want to take a scraper, a spoon, (really anything will work) and scoop up the excess residue from the Instant Medic.


This is important because if you don’t remove this, it’s going to leave a big ridge on the floor, which you definitely don’t want. You’ll have a little bit of work time, but it does harden pretty quickly, so just scrape it flush while you can.


At the same time, you want it to be flush or even a little overfilled before you want it unfilled at all. If there are still gaps in the crack (meaning you scraped too much out) you’ll have to go over it again.


But If it’s just a little raised, you can go over it with a Flap Disc or a Floor Disc like the one to the right. You can put this on the bottom of an


STI Floor Discs

angle grinder and apply it to the area, which will get rid of the excess there just fine.


If you’re using our polish system, here is a good chance to use the Concrete DNA Diamond Pad (30 or 50 grit) ran wet will get rid off that excess product too.


Any questions? Leave them below!

Instant Medic Concrete Filler

These videos uses our Instant Medic to fill in the joints in the video. You can find this at the link below.
Get Instant Medic

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