| abstract |
The present invention provides a coating composition which exhibits an excellent rust-preventing effect and is excellent in drying property at the time of coating, penetration into a rust surface, and excellent adhesion to a metal. [Solution] It is characterized by containing a tannin substance, an oxidative polymerization type resin, an organic solvent, a curing catalyst, and an organic acid. Further, it is preferable to contain a silane coupling agent. [Selection diagram] None |