An anticorrosive coating process comprises:(i) a step of applying on a substrate a zinc-rich paint or an epoxy resin primer coating, followed by air-drying,(ii) a step of applying thereon an intermediate synthetic resin coating, followed by air-drying, and(iii) a step of applying thereon a top coating comprising (a) a fluorine-containing copolymer composed of from 40 to 60 molar % of a fluoroolefin, from 5 to 45 molar % of cyclohexylvinyl ether, from 5 to 45 molar % of an alkylvinyl ether, from 3 to 15 molar % of a hydroxyalkylvinyl ether and from 0 to 30 molar % of other comonomer and (b) a polyisocyanate, followed by air-drying.