Clear over basecoat system

CLEAR OVER BASECOAT SYSTEM - BLUE POLYCHROMATIC BASECOAT... 

Car paints are cured with heat in special oven lines. Electrodeposition coatings (used as anticorrosive primers) contain only small amounts of volatile organic compounds (VOC), whereas intermediate and topcoats release considerable amounts of VOCs. Intermediate coats based on waterborne resins have been developed to decrease VOC emission and are already being used in some automotive plants. Basecoats, as part of base-clear topcoat systems, contain very high amounts of volatile organic solvents. Waterborne basecoats were developed more recently to lower this source of solvent emission. Some car manufacturers are operating pilot lines with the aim of introducing waterborne basecoats into their production processes. Many car producers in the United States and Europe have already switched their topcoat lines over to waterborne basecoats [11.3]. 

Uses Acrylic for prod, of unicolored automobile finishes and isocyanate systems, with light stabilizer for clear coats over metallic basecoats Features Heat-reactive with amino resins superior radiance, high surf, hardness, exc. weather resist. 

A typical clear, high build overlacquer for low bake curing is given below. It is suitable for use in a COB system over a basecoat. A typical basecoat formulation for COB application is given in the TSA chapter. 

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