Mastic, a generic term for durable surface material made of mineral filler and asphalt binder, is especially suitable for heavily trafficked roads. The polymer-modified binder consists of engineering aggregate and is poured hot. When properly applied, asphalt mastic repairs can last longer than five years. Mastic is also ideal when a repair is too small for a full replacement but too large for crack sealing, and it can be used to repair areas where concrete has shifted.