A prime coat is a spray application of bituminous material applied to the surface of a base course that is to be covered with an asphalt pavement layer. The primary purpose of the prime coat is to waterproof the unbound material until it can be covered with asphalt mixture. The prime coat can also help prevent damage to the base during construction.
The tack coat is applied to an existing pavement surface before it is overlaid with a new
asphalt overlay. The tack coat provides a bond between the old and new pavement.
Fog Seals and Rejuvenators
Consider surface treatments for use when non-load-associated surface distresses such as non-structural cracking or raveling first begin. The recommended sealer process, once non-structural cracking and/or raveling is first observed, is a fog seal (except for runways). Continue application of the fog seal on an approximately three-year cycle, depending on pavement condition, as long as surface friction.
Rejuvenators are used to restore oxidized pavement surfaces. Rejuvenators do not solve raveling issues (unless raveling is very
minor) or reduce cracking problems (unless cracking is very minor hairline cracking). Often, rejuvenators can cause pavement surfaces to be slippery for up to a year; therefore, choose areas and application rates with extreme care.
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Tracy, CA 95304
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