Tack coats are very light spray applications of diluted emulsion. It is used to create a bond between an asphalt overlay being placed and the existing surface. Asphalt emulsions commonly used for tack coats are SS-1, SS-1h, CSS-1 and CSS-1h. The emulsion is diluted by adding an equal amount of water, preferably warm water.

To prevent premature breaking, water is always added to the emulsion, never the reverse. Tack coats may also be used in patching applications. The tack coat helps hold the patch and provides a watertight seal.

For more information on Tack Coats please visit Norjohn Contracting.