A tack coat is a very light spray application of diluted
asphalt emulsion.
It is used to ensure a bond between a surface being paved
and the new course. For most overlays, a tack coat is
advisable.
Fog
Seal Emulsion
A fog seal can be a valuable maintenance aid when used
for its intended purpose. It is neither a substitute for
an asphalt surface treatment nor a seal coat.
It is used to renew old asphalt surfaces that have become
dry and brittle with age and to seal small cracks and
surface voids.
