Coating compositions are provided which include a polysiloxane comprising
at least one reactive functional group and at least one material comprising at
least one reactive functional group. Also provided are multi-layer composite coatings
formed from a basecoat deposited from a pigmented coating composition and a topcoat
applied over the basecoat, the topcoat deposited from the aforementioned coating
composition. A method for improving the scratch resistance of a coated substrate,
as well as coated substrates also are provided. The compositions of the invention
provide highly scratch resistant coatings, particularly highly scratch resistant color-plus-clearcoatings.