 The aggregate is evenly distributed over the hot seal spray, then rolled into the bitumen using heavy rubber tyred rollers creating a paved surface.A chip-seal-surfaced pavement can optionally be sealed with a top layer, which is referred to as a fog seal or enrichment.The introduction of polymer-modified bitumen and emulsion binder has increased chipseal's ability to prevent crack reflection and improve stone retention by improving the properties of the bitumen binder.