DURA-FILL^® Mastic LT

General Information

Description: Dura-Fill Mastic LT is a hot-applied repair mastic specially formulated for use in cold climates. It is comprised of a black, asphalt-based, polymer-modified binder and a select aggregate. This material is self adhesive. Dura-Fill Mastic LT resists cracking, delamination and spalling. It is a flexible material that can withstand heavy loads, weather, traffic and thermal movement. Mastic LT provides a high-friction surface to ensure driver safety. Compaction equipment is not necessary with Dura-Fill Mastic LT. This repair system is formulated to provide a feathered edge.

Recommended Uses: Dura-Fill Mastic LT is recommended for sealing wide cracks and joints, as well as repairing a large variety of distresses in cement and asphalt pavements. It is designed for large cracks and distressed surface areas too small for re-paving yet too large for traditional hot-applied crack sealants.

Surface Preparation: Proper surface preparation facilitates adhesion and consequently the maximum service life of the mastic. In order for proper adhesion to occur, the surface must be free of moisture, dust, loose aggregate and other contaminates. Avoid use in highly-distressed areas that require reconstruction. The substrate and air temperatures must be 40 °F or above. Use oil-free compressed air and heat to clean and dry the area immediately prior to application. Heating the pavement will promote bonding between the mastic and pavement surface. Caution: Do not to overheat/oxidize the pavement.

Melting and Application: Melt Dura-Fill Mastic LT using an oil-jacketed kettle designed for mastic materials. The kettle should be equipped with an agitator and temperature control devices for the material and heating oil. Carefully insert small quantities of Dura-Fill product and the plastic bag into the melter while the agitator is turned off to avoid splash back. Once material has reached application temperature, apply to freshly prepared area. Dura-Fill Mastic LT can be applied directly from the melter using an appropriate flute, bucket, or mastic wagon. Immediately following application, the mastic shall be leveled and smoothed using a hot iron. In deep installations, mastic may be applied in layers, cooling in between. When mastic is installed where added skid resistance is desired, Dura-Fill Mastic LT may be covered with Dura-Top™** surface aggregate. Dura-Fill Mastic LT is ready for traffic when it has cooled and solidified.

Note: The temperature of the heating oil should not exceed 525 °F. Do not heat material over the maximum heating temperature and do not maintain it at that temperature for prolonged periods of time. This could cause the material to gel in the equipment or fail on the pavement. A significant viscosity increase accompanied by stringiness signals the onset of gelation. If this occurs, immediately remove the material from the melter and dispose of it.

For further details read and follow the Dura-Fill SDS, Mastic Installation Instructions, and P&T Products’ Warranty.