Hot enamel coatings for underground pipeline protection have given good service for many years on thousands of miles of pipe. However, they exhibit several disadvantages, among which are cold and hot flow, cold weather inflexibility and brittleness, great weight, a relatively high water absorption, and a major contribution to pollution. The need for coatings which would combine the good features of coal tar with improved properties thus has been known for many years, and many candidate coatings have been offered to the industry to fill this need.

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