Abstract: A curable film-forming composition is provided, comprising: (a) a polymeric binder having reactive epoxy functional groups; and (b) a curing agent. The curing agent comprises an acid functional reaction product of: (1) a hydroxyl functional polymer comprising the reaction product of: (i) a monomer comprising at least two ethylenically unsaturated double bonds; (ii) a monomer comprising a carbon atom that is bonded to four different moieties, wherein one of said moieties is a hydrogen atom and the remainder of said moieties independently comprise alkyl groups, wherein one of the alkyl group-containing moieties comprises an ethylenically unsaturated double bond; and (iii) at least one monomer that is polymerizable with (i) and (ii); and (2) an anhydride. Also provided is a multi-component composite coating composition that includes the curable film-forming composition described above.