How is mastic repair material applied?

Mastic is a repair for small highly distressed areas, but remember the underlying base is still not repaired. Mastic is discharged from a melter typically using a chute, and can be either poured directly into a pothole, or discharged into conveyance units and spread over cracks using a drag box or squeegee. Mastic is self-leveling, so the repair material does not need to be compacted.

Weather and surface conditions for application of mastic are forgiving, but there are some points to remember.

  • The pavement temperature needs to be 40°F or above, which can be achieved by the use of a heat lance on cooler days.
  • The area to be repaired with Mastic needs to be clean and dry.
  • Mastic cannot be pumped, so a specialized mastic melter/discharge unit is required.
  • Traffic typically can be allowed onto the newly patched area within 30-60 minutes, depending on the depth and width of the patch, the air and pavement temperature, and other factors that impact how quickly the patch cools.

May 2022