Unique Paving Materials Corp.'s Concrete Patching Material (CPM) is a high-strength, rapid-developing, commercial-grade concrete patch for patching, repair, and restoration on roads, bridge decks, sidewalks, curbs, driveways, and slabs. A 2-in. layer begins to set up within 20 minutes, and the area can be reopened to traffic in as little as 45 minutes to an hour. For deeper repairs (more than 6 inches), a second layer can be applied after 30 minutes. One 5-gal. pail covers approximately 16 sq. ft. (at a 1/4-in. thickness).