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The primary reason to seal coat pavement is to protect it from environmental effects--water and sun. A seal coat provides waterproof membrane that slows oxidation, helps prevent water from entering the base.
The secondary benefit of seal coating is increase surface friction. Seal coats are affected greatly by weather conditions, especially during construction. The ideal conditions for applying a seal coat are a warm, sunny day with low humidity.
Steps in the process:
First step: Application of a seal coat is to ensure the street is prepared by making minor repairs and thoroughly cleaning the surface.
Second step: Spraying asphalt cement on the surface of the existing pavement using an oil distributor.
Third step: Applying a cover aggregate using a chip spreader.
Fourth step: Rolling the cover aggregate into the asphalt cement as soon as possible.
Final step: Sweeping the street after 24 hours.