Repair Hairline Cement Cracks
Although cement is a durable material, it is not uncommon for hairline cracks to form. These small, thin cracks are usually the result of the cement structure or surface settling. When addressed at first sight, hairline cement cracks are harmless and can be repaired quickly, preventing any major problems down the road. It is important to fix hairline cement cracks as soon as possible so that the crack does not expand, causing a larger crack, or even a hole, to form.
Instructions
1. Clean the crack, as well as about three inches of cement surrounding the crack on both sides, before fixing it. Wash the crack with a rag and plain water. Clean the surrounding three inches of cement with a wire brush and water to remove any loose or chipping paint.
2. Fill an empty spray bottle with plain water. Spray the crack with the water. Continue to spray the crack periodically, as the water begins to dry, for about three hours. Keeping the crack wet prior to patching will prevent the cement from drawing water from the patching compound.
3. Mix a batch of Portland cement and water in a small container. Refer to the label on the cement for specific mixing instructions. The patching compound should be the consistency of a thick paste.
4. Apply the patching compound to the crack, using a putty knife or trowel. Scoop up a generous amount of the patch onto the tool and spread it over the crack, forcing it into the crack as much as possible. Run the trowel or putty knife over the crack to smooth out the patch so that it is flush with the cement surface. Add more patching compound in the same fashion until the entire crack is filled.
5. Allow the patching compound to dry for two to three hours. Cover the newly patched area of cement with plastic sheeting and tape. Remove the plastic cover and lightly mist with water every day for five days.
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