Method for coating substrates with water and oil base paints on a single

Abstract

A coating line contains a water paint coating step for forming a coat by coating a substrate with a water paint; a pre-heating step for pre-heating the coat; and a baking step for drying the coat by baking. In the coating line, the substrate coated with an oil base solid paint is further coated with the oil base solid paint in the water paint coating step. The substrate is then transferred to the next step by bypassing the pre-heating step or by passing through the pre-heating step which is not heated by turning a pre-heating device disposed therein OFF. The coating line may be provided with an oil base clear paint coating step to thereby form an oil base clear paint coat yielding a two-layer coat. By coating the oil base solid paint in the clear paint coating step only, a one-layer coat can be given. In the clear paint coating step, an oil paint can be coated in the coating line which is provided with a second pre-heating step subsequent to the clear paint coating step yet prior to the baking step. In this case, the oil base solid paint is coated in either of the clear base paint coating step or in both, and the coat formed is transferred to the next step by bypassing the second pre-heating step or by passing through the second pre-heating step which is not heated.