When cracks develop in concrete, they’re unsightly. And if you ignore them, they can become major problems that are time-consuming and expensive to fix. Here are two ways to repair cracks in driveways, garage floors, patios, sidewalks and other concrete surfaces. All you need are a few simple tools and the right patching materials.
NOTE: For your safety, wear eye protection and gloves when repairing concrete.
Step 1: Clean Them Out
To repair small cracks in places like concrete sidewalks, driveways, garage floors and patios, use a wire- or stiff-bristle brush to clean loose debris from crack. Or carefully blow out debris with a shop vac or leaf blower.
Step 2: Apply Sealant
Fill narrow cracks and gaps with a concrete sealant such as DAP Textured Concrete Filler & Sealant, using a caulk gun. Not only is it waterproof and paintable, but it’s also textured to provide a seamless blend with most concrete surfaces. And DAP Textured Concrete Filler & Sealant stays flexible to prevent cracking or loss of adhesion. It fills cracks up to ½ inch wide by ½ inch deep (for deeper cracks, insert backer rod material into the crack first).
Step 3: Tool, if Necessary
Use a wet margin trowel or wet flexible putty knife to gently tool the sealant immediately after applying, if the area needs smoothing and leveling. If the repair is exposed to the elements, anchor a piece of plastic loosely over it for 24 hours to keep it dry.
Step 1: Clean Them Out
To repair large cracks (more than ½ inch wide), clean out loose debris with a wire- or stiff-bristle brush. Or carefully blow out debris with a shop vac or leaf blower.
Step 2: Clean the Surrounding Area
Scrub off any oil or grease several inches around the area and rough it up using a stiff-bristle brush and a solvent such as mineral spirits. Rinse well. Or use Rust-Oleum Cleaner & Degreaser.
Step 3: Apply Patching Material
Fill in the area to be repaired with DAP Ready-Mixed Concrete Patch. It resists oil, grease and salt, and dries to a concrete-gray color. It also can be used to patch holes or glue together broken pieces of concrete. Using a flexible putty knife, broad knife or trowel, press it into place (to remove any air) and feather the edges on the surrounding surface. If the repair area is deeper than ½ inch, apply the patch in ¼-inch layers, for a maximum depth of 1 inch, allowing each layer to dry before applying the next. If desired, patched areas can be painted with latex paint after two to four hours or with alkyd paint after 24 hours, depending on humidity and temperature.
BONUS TIP: If you want to paint concrete after patching, clean the surface with Rust-Oleum Cleaner & Degreaser, and spot-etch it with Rust-Oleum Clean & Etch. Paint with Rust-Oleum Concrete and Garage Floor Paint. This self-priming acrylic paint with a satin finish can be used indoors and outdoors. It requires only one coat and resists fading, chipping and stains, even when exposed to sunlight, weather, hot tires or chemicals.
High performance, self-leveling, no-shrink hybrid filler and sealant that requires no tooling and provides superior flexibility and adhesion for a 100% weatherproof seal, backed with a lifetime guarantee.