Abstract: Provided is a paint composition for a two-step curing process including a binder resin containing a hydroxyl group and a hardener having a functional group reactable with the hydroxyl group. The paint composition includes: one or more binder resins selected from the group consisting of a polyester resin, an alkyd resin, an acryl resin, and a modified resin thereof; and a hardener including one or more selected from an isocyanate group and one or more selected from a melamine group, wherein mechanical processing is performed on a steel sheet coated with the composition and primarily cured, and then mechanical and chemical properties of a coating layer damaged during the mechanical processing are recovered through secondary curing.

Abstract: Provided is a paint composition for a two-step curing process including a binder resin containing a hydroxyl group and a hardener having a functional group reactable with the hydroxyl group. The paint composition includes: one or more binder resins selected from the group consisting of a polyester resin, an alkyd resin, an acryl resin, and a modified resin thereof; and a hardener including one or more selected from an isocyanate group and one or more selected from a melamine group, wherein mechanical processing is performed on a steel sheet coated with the composition and primarily cured, and then mechanical and chemical properties of a coating layer damaged during the mechanical processing are recovered through secondary curing.