| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating composition for an undercoat effecting a high content of solid matter in coating and capable of forming a coating film excellent in drying ability and substrate-shielding ability, particularly useful in the automobile-repair field and a coating method for repair employing the coating composition. SOLUTION: This coating composition for an undercoat comprises (A) an acrylic resin having a hydroxyl value of 30 to 85 and a weight average molecular weight of 1,000 to 30,000, (B) a pigment, (C) resin fine particles, (D) a polyisocyanate compound and (E) a curing catalyst. The ratio of isocyanate groups in the component (D) to 1 equivalent of hydroxyl groups in the component (A) is 2.0 to 4.0 equivalents. The content of the component (B) is from 100 to 500 pts.wt. relative to 100 pts.wt. resin solid matter. The component (C) is mixed so as to be 0.1 to 5 wt.% as solid matter relative to the weight of the component (B). In the coating method for repair, the above coating composition is used for undercoating.
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