Concrete resurfacer
A bagged polymer-modified cement product spread thin over sound but worn concrete to restore a uniform surface, widely sold for driveway and patio repair.
What does concrete resurfacer mean?
Resurfacers are cosmetic and only as good as the bond beneath them, so surface preparation by pressure washing, profiling, and removing all sealer is the entire job. They cannot fix structural problems, active cracks, or slabs that are settling, and applying them over a spalling surface simply relocates the failure. In freezing climates a thin resurfacer over a salt-damaged slab is often a short-lived repair.
In practice
The home center bag that promises to make a spalled driveway look new works only when the underlying slab is genuinely sound.