Gap Patch 531 – Mastic Patch
Maxwell GAP|Patch 531 is a hot-applied, permanent pothole and wide-crack repair compound engineered for asphalt and Portland cement pavements. Built with a specialized aggregate blend, it delivers lasting structural repairs across a wide range of climates and pavement conditions.
- Permanent repair solution for potholes, depressions, wide cracks, and distressed pavement areas
- Hot-applied formula with a recommended application temperature of 380°F (193°C)
- Flexible down to -15°F (-26°C) with a softening point of 200°F (93°C) minimum
- Suitable for highways, municipal streets, parking lots, and airport surfaces
- Effective for full-depth repairs through to skin patching
- Compatible with both hot-mix asphalt (HMA) and Portland cement substrates (primer required for cement)
- Available with Polyskin packaging technology for simplified handling
- Description
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Description
Maxwell GAP Patch 531: Hot-Applied Permanent Pavement Repair
When potholes, wheel ruts, and deteriorating pavement sections need a fix that holds, GAP|Patch 531 is the product crews across Canada rely on. This hot-applied repair compound is formulated for permanent results, not temporary patches that crack and shift with the seasons.
At the core of GAP|Patch 531 is an engineered aggregate system designed specifically for strength, load stability, and long-term durability. Unlike cold-pour fillers that soften in summer heat or become brittle in winter cold, this product performs across a broad temperature spectrum, making it a practical choice for Canadian contractors dealing with freeze-thaw cycles and variable job site conditions.
Versatile Repair Applications
GAP Patch 531 handles a wide range of pavement defects in a single product:
- Potholes and voids of varying depth
- Very wide cracks and surface depressions
- Alligatored and distressed pavement sections
- Areas around embedded structures such as manholes, drains, and gutters
- Deteriorating road shoulders and raveling pavement seams
- Wheel ruts and localized surface failures
Whether the repair requires full-depth fill or surface-level skin patching, GAP|Patch 531 adapts to the scope of work without requiring multiple products on the truck.
Substrate Compatibility
GAP Patch 531 bonds directly to hot-mix asphalt under standard conditions. For Portland cement concrete substrates, or during damp and cold-weather installs on HMA, priming with Maxwell Products’ GAP Primer (or an approved equivalent) is required to ensure proper adhesion. If working in winter conditions, the repair area should be pre-heated with a torch to allow primer to cure adequately before product application.
Heating and Application
This product requires indirect heating, using either a double boiler or a hot oil circulating kettle with continuous agitation to keep the aggregate evenly suspended throughout the mix. Do not exceed the maximum safe heating temperature of 400°F (204°C). Optimal application occurs at 380°F (193°C). For best setup time, ambient temperatures between 25°F and 75°F (-4°C to 24°C) are recommended.
| Property | Result |
|---|---|
| Cone Penetration | (77°F, ASTM D5329)70 dmm max |
| Softening Point (ASTM D36) | 200°F (93°C) min |
| Flexibility (1 in. mandrel, 90° bend) | Pass at -15°F (-26°C) |
| Tensile Adhesion (77°F, ASTM D5329) | 600% min |
| Resilience (77°F, ASTM D5329) | 35% min |
| No. 4 sieve, passing | 95% min |
| No. 16 sieve, passing | 10% max |
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