Organic coatings have long been used to serve protective as well as decorative functions on steel and other substrates susceptible to corrosion. Automotive paint systems have evolved through many changes in resin chemistry, pigmentation, and application methods to meet the protection requirements imposed by different and changing corrosive environments. The corrosive environment encountered on the streets and highways in certain areas of North America has become more severe in recent years as ever larger quantities of deicing salts are used (1,2). Regulations limiting solvent emissions from painting operations and restrictions on certain toxic materials have further complicated the coatings development problem.

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