Fill in concrete cracks
WHEN AND HOW TO FILL IN CRACKS
We get asked all the time when should cracks be repaired both size wise and timing wise as far as etching and coating the floor. Lets start with when you should repair any cracks or divots in your concrete floor. If you’re using our Ready Coat Crack Repair, you would do the repairs after you have cleaned and etched your floor and the floor has dried. You would then simply mix the Part A & Part B together to form a sort of a putty and then you would putty knife it into any cracks or divots. Let it sit a minute or two and then you can apply our epoxy right over it without having to wait for the putty to cure. This saves you a whole day or more waiting for your repair compound to cure.
For larger cracks and holes in your concrete slab we have a Crack & Joint compound. This Part A & B get mixed together and then you add in approximately 50lbs of playground sand per gallon of Mortar Liquids and mix together until it becomes a grout consistency. Then you trowel into the repair areas, scrape flat and let cure for at least 24 hrs. If some of your repairs came out a little rough, you can hand grind them smooth. Use this product prior to your etching. 
When do cracks need to be filled in? Our epoxies are thick and can fill in surface cracks. The trick is to know if the crack is at the surface or if it runs the depth of the slab. Even hairline cracks that run the depth of the slab will consume a lot of epoxy to fill them up. Best to use one of our crack compounds to fill them in. For small cracks you can run a grinder wheel down the crack to V out to make it easier to apply the repair compound into them.
For Control Joints and Expansion Joints use the Epoxy Crack & Joint Compound with the sand to fill in. Please note we always recommend not filling them in. Once you fill these in you run the risk of getting a crack down the middle of your brand new high gloss epoxy floor. Especially on newer floors. Although these joints look unsightly now and are garbage collectors, keep in mind that once you’re done epoxying the floor the joints will actually make the floor look better and since the joints are now epoxy painted no dust and dirt will stick inside them. So, unless the control or expansion joints make you physically ill at the sight of them, don’t fill them in, just finish them inside and out with the epoxy.
Check all of our concrete crack repair products at www.armorgarage.com