Step 1 Widen the crack using a chisel and hammer to a minimum of ¼ inch and break away any deteriorating concrete (the edges of the … You can do it in less than a half hour. When the water evaporates, the salt is left behind. The best approach would be to strip all the sealer and wax off the concrete. The crack filler is less likely to fail if it is firmly seated in the crack, as opposed to simply putting it over the surface as you would apply tub caulk! Since the errant chalk line can't be removed, I … Then, the chalk can be applied to the sidewalk like paint. This technique will work for cracks smaller than 3/8 inch wide in the sidewalk, driveway, garage floor, basement, or … larger than the crack. In a November 1997 Problem Clinic item (p. 928), a contractor wants to know how to remove unwanted chalk lines from a concrete driveway. Chalk pastels are dipped into a container of water for up to 6 minutes, until the tip of the chalk pastel is soaked and softened. Won't work as advertised. The first step is to, if necessary, open up the crack so it is at least 1/4" wide and at least an inch or so deep. Once the sealer and wax are removed, a moisture test should be conducted so you can get an idea of how much water is moving through the slab. Fill the gap with caulk, them smooth the caulk with a plastic spoon. Fill the crack with concrete repair caulk, such as Polyurethane Concrete Crack Sealant from Quikrete. The test results will dictate your next step. QUIKRETE Concrete Repair, QUIKRETE Gray Concrete Crack Seal or QUIKRETE Self-Leveling Polyurethane Sealant may be used. I will be using a spray pot sealer for the inside of the pot to prevent water seepage through the concrete onto the paint but what about the outside of the pot to seal the chalk paint? Be sure to use a caulk that's formulated for use with concrete (it’ll say so on the label). The chalk is actually salt deposits brought to the surface of the concrete by water. My theory is "if you can't kill the bull, you best run the other way." Seal cracks in concrete with durable urethane caulk. I have a large round concrete garden planter which I have painted in ASCP Duck Egg. In this technique, the colors will be easier to blend together and also will be able to cover large areas of the concrete canvas. Do I need to seal the paint before using it to plant up my tulip bulbs. Defeats the purpose of the stain. To seal a cracked concrete slab: Remove any debris or loose concrete in the crack using a screwdriver, followed by a wire brush. Filling small cracks in concrete keeps them from turning into big holes. Use a broom or leaf blower to clean out the crack. I know this doesn't help in regards to removing the red chalk, but if it were me I would use a TSP product and a lot of elbow grease. below the concrete surface. If you know how to fill small cracks in concrete, you’ll restore your concrete to a smooth finish. 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