When a crack is larger than 1-½” a more optimal option is gap mastic. Gap mastic is flexible, adhesive, and durable. When this option is needed the representative at Preferred Paving will explain this, and advise only when it is truly necessary.
Asphalt can be replaced very easily. There are many options for repairs, patching, overlays, crack sealing, and seal coat are a few options. Depending on the condition of the asphalt there are many times when doing large crack seals is the easiest and cheapest route.
Gap mastic is very flexible, and works very well in situations where there is a lot of movement. An example of a lot of movement is freeze/thaw cycles. It can be applied for smoothing rough surfaces, and will make the ride of the asphalt smoother.