A film-forming composition that includes a stable aqueous dispersion of a
mixture of a polyester polyol and a carboxylic acid-containing acrylic
polymer polyol and a crosslinking agent having functional groups reactive
with hydroxyl groups. The weight ratio of polyester polyol to acrylic
polymer polyol is in the range of 10:90 to 30:70. The crosslinking agent
is one or more blocked isocyanates or aminoplasts. The equivalent ratio of
hydroxyl groups to reactive functional groups on the crosslinking agent is
from 0.8:1 to 1.7:1. The film forming composition can be used in
multi-layer composite coating compositions that include a base coat layer
and a substantially pigment-free topcoat deposited over at least a portion
of the base coat layer, the topcoat composition including the present
film-forming composition.
