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There’s no legal requirement that states that you need rebar in a concrete driveway, but since the slab will be supporting heavy vehicle loads, it’s always a good idea to pay a bit more for rebar reinforcement. Your driveway will be much more likely to crack if you don’t reinforce it with rebar. Driveways that need to support commercial vehicles or provide parking for multiple vehicles at once should always include rebar reinforcement. If you’re pouring concrete over asphalt or pouring concrete over an existing slab, you may not have enough depth for rebar, meaning an increased risk of cracking.

Mix the resurfacer into a sticky mixture. The consistency should look like mashed potatoes. Use a squeegee to push the resurfacer across the pitted area and smoothen the surface with a cement trowel flush. Make sure you protect any expansion joints with a weather strip. Alternatively, cut out any resurfacer that touched the joint once the mixture begins to harden.

Small cracks should be filled with a flexible crack filler, like a rubberized asphalt-emulsion crack filler or a flexible masonry crack filler. Larger cracks need something a bit more solid to prevent further movement and to avoid having to use too much of the flexible filler. For concrete, you can use a concrete backer rod while asphalt can handle sand, gravel, or even dirt.

Efflorescence can damage a concrete slab for two to three years. After that, it resolves on its own once the surrounding salts are gone.