Patching and Resurfacing Cracked Concrete: A Contractor's Guide to Mapei at Lowes

Mapei's concrete resurfacer from Lowes is the fastest fix for cracked slabs and floors. Here's how to prep, mix, and finish it right the first time.

Cracked concrete looks permanent. It isn't. With the right product and technique, you can resurface a cracked slab, driveway section, or garage floor to a smooth, durable finish — and Mapei makes the product that makes this achievable for anyone willing to do the prep work correctly.

When to Patch vs. When to Replace

Patch it if: cracks are surface-level (less than 1/4" wide and not moving), the slab is structurally sound, and water isn't pooling in the cracks and undermining the base.

Replace it if: the slab is heaving (different sections at different heights), cracks are wide and irregular, or the base has failed — probe the crack with a screwdriver; if there's soft material underneath, no resurfacer will hold long-term.

The Product: Mapei Concrete Resurfacer

Mapei's Concrete Resurfacer (available at Lowes in 40 lb bags) is a polymer-modified cementitious product that bonds to existing concrete and can be applied from a feather-thin skim coat up to about 1/2" thick. It mixes quickly, levels smoothly, and gets hard enough for foot traffic in about 6 hours.

Prep: The Step That Determines Everything

The number one reason resurfacing fails is inadequate prep. The existing concrete must be clean, open-pored, and pre-wetted but surface-dry.