SealMaster CrackMaster Hot Pour Crack Sealants

CrackMaster Mastic Black

Hot-Applied, Polymer-Modified Mastic Asphalt Binder

CrackMaster Mastic Black is a hot-applied, polymer-modified mastic asphalt binder; factory-blended with graded fillers, steel fibers, granite aggregates and recycled tire rubber. Meets ASTM D8260-20 hot-applied asphalt aggregate-filled mastic.


CrackMaster Mastic Black is a hot-applied, polymer-modified mastic asphalt binder; factory-blended with graded fillers, steel fibers, granite aggregates and recycled tire rubber. It is designed to replace traditional hot pour crack sealants which lack structural strength and other more rigid patches like cold patch or hot mix that are prone to failure due to their stiffness or poor quality. CrackMaster Mastic Black contains load-bearing, engineered aggregate for structural strength, while the binder allows for bonding and adhesion to existing pavements, along with flexibility and elasticity. Meets ASTM D8260-20 hot-applied asphalt aggregate-filled mastic.


  • Load transferring repair with superior tensile strength and flexibility.
  • Accommodates limited joint/crack movement due to thermal expansion and contraction, and vibratory movements.
  • Flexible, enduring, skid-resistant finish.
  • Resistant to water intrusion and broad range of salts, bases and organic materials.
  • Year-round application with no temperature limitations.
  • Extends the service life of asphalt.
  • Rapid cure allows repairs to be open to traffic within 30 minutes.


Mastic is ideal for pavement conditions that are too severe for crack sealing and too small for repaving. And the use of mastic among contractors and public works agencies continues to rise because it’s a durable and cost-effective way to make repairs, allowing maintenance dollars to go further

Mastic can be used to repair:

  • Cracks larger than an inch wide
  • Pavement seam failures
  • Longitudinal shoulder joint failures
  • Potholes
  • Utility cuts
  • Depressions, ruts, and low areas
  • Large joints around raised manholes and catch basins
  • Uneven pavement
  • Raveled and delaminated pavements


Clean and dry repair surfaces with a hot air lance. Remove all loose debris. If desired, a jack hammer or milling machine may be used to clean and prepare the area to be repaired.

Application of the CrackMaster Mastic Black material shall be by factory trained and certified installation professionals.

CrackMaster Mastic Black material is heated in a thermostatically controlled, purpose-built mixer, having a horizontal agitator that ensures complete mixing. Once the material reaches approximately 370 to 400 °F (189 to 204 °C), pour molten CrackMaster Mastic Black into the prepared area, sealing the bottom of the repair from water intrusion.

When using as a patching material, If the depth of the repair exceeds 1 inch and the width exceeds 4 inches, the remainder of the repair process will consist of layering coarse, hot angular aggregate (cleaned and dried) at a rate of 25% – 55% by volume with the molten CrackMaster Mastic Black until within 3/4” of the top of the repair. The bulking aggregate must be worked into the patch completely. NO DRY LAYERS OF BULKING AGGREGATE WILL BE ALLOWED.

The final 3/4” of the repair will be CrackMaster Mastic Black material for optimum flexibility of the repair. This top layer must be screeded to a level grade. Depending on the depth of the repair, the CrackMaster Mastic Black material will be ready for traffic return between 30 minutes to 1 hour.

When using as a wide crack filler 1-4” wide, use a screed box to deliver the molten material to the repair area. Use multiple passes as necessary to ensure that the molten material is level with the existing surface. Scrape edges as necessary to ensure a good riding and aesthetically pleasing repair.


See SDS for complete safety precautions prior to use. Use HSE-approved personal protective equipment (PPE), including safety glasses, gloves and confined space equipment/procedures if applicable. Avoid skin contact; do not ingest. For professional use only.

Clean Up

All removed materials and residual repair materials will be recovered and disposed of away from the site according to the client’s specifications. All Federal, State and OSHA safety requirements must be followed during installation.