How to repair a minor crack in concrete:
1. Clean the area so that it is free of debris. You can sweep it out, or use a wire brush or vacuum it out with a shop vac. It must be dry before you move to step 2.
2. Apply caulk into crack. Use an ample amount of caulk to fill the crack to just above the surrounding surface.
3. Take a trowel and smooth out the caulk so that it is level with the surrounding area. If the crack is small enough, you can use your finger to smooth out the caulk (make sure to wear a rubber glove).
4. Let dry for at least two hours.
How to fill a gap in concrete:
1. Make sure the area is dry and clear of debris.
2. Take caulking and apply it to the entire length of the gap. Use generously
3. You can even out the caulking with a glove-covered finger, a trowel, or the back of a spoon rubbed with oil you can use any oil—baby vegetable, olive, even suntan oil.
4. let dry for at least 4 hours.
How to repair a small hole in concrete:
1. Break away any loose or unstable material. The easiest way to do this is with a small chisel and hammer.
2. Clean up any excess debris. If you can use a shop vac, it’s best. Make sure area is dry
3. Use a paintbrush to apply the bonding adhesive to the entire area that needs to be patched.
4. Fill the area with the reinforced patching compound, only adding about ‘4 inch at a time.
5. Wait about 30 minutes for the layer to dry.
6. Apply additional layers until you have filled the hole to just above the surrounding surface area.
7. Use a trowel to smooth out the area being repaired, until it is level with the surrounding area, its okay to let the mixture feather over the surrounding area to get a good, level base.
8. Allow the mixture to cure (or dry). Although it will take months to completely cure, you will begin to see hardening within the first few minutes, and it will be hard enough to walk on within 2 hours.