Produce a slipping property imparting agent for clear coat that reduces scum production: wherein, (1) the agent comprises a copolymer whose constituents are unsaturated olefin (constituent (a)) and unsaturated carboxylic acid (carboxylate) (constituent (b)); (2) constituent (a) accounts for 50 to 99 mol percent and constituent (b) accounts for 50 to 1 mol percent, respectively, of the total mol number of constituents (a) and (b) combined; and (3) a constituent (c) that can be polymerized with the constituents (a) and (b) is contained, as necessary, by up to 20 mol percent of the total mol number of constituents (a) and (b) combined.