Q: Our concrete walk has pits and seems to be crumbling. How can we fix it?
—Jace Laakso, Missoula, Mont.

Tom Silva replies: Spalling, the pits that form in concrete, happen when too much water is used in a concrete mix, weakening it.

As long as your walkway isn't cracked all the way through, you can coat the slab with a concrete resurfacer, a no-shrink blend of Portland cement, sand, and polymer additives that fills divots and makes a uniform finish. Its natural color is dark gray, so buy enough to cover your entire walk. One 40-pound bag coats about 35 square feet. If you want a different color, just add a concrete tint.

Before resurfacing, strip off any paint or sealers and watch the weather. Temperatures should remain above 50 degrees F for 8 hours after the pour and above freezing for 24 hours after that.

Resurfacing takes most of a day, but your walkway will be back in pristine shape once you're done.
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    Tools List

    • gas-powered pressure washer
    • bucket with sponge
      5-gallon bucket
    • flat finishing trowel
      finish trowel
    • nylon-bristle broom
      nylon-bristle broom, for a slip-resistant finish

    Shopping List

    1. Concrete resurfacer
    Get a 40-pound bag.

    2. Concrete wash
    Get a 1-gallon bottle. For preparing the concrete walkway before resurfacing.

    3. Peel-and-stick black-foam weatherstrippping to protect the walkway joints.