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.