A curable film-forming composition is provided comprising (i) 10 to 90 percent by weight based on the total weight of resin solids in the film-forming composition of a crosslinking agent; (ii) 10 to 90 percent by weight of a polymer containing a plurality of functional groups reactive with the crosslinking agent; and (iii) 5 to 85 percent by volume of particles having a mean particle size less than 100 nm. The particles comprise 1 to 99 percent by weight of at least one metal oxide wherein the metal is selected from zinc, titanium, cerium, manganese, bismuth, copper, zirconium and iron.A multi-component composite coating composition is also provided, comprising a pigmented basecoat and a clear coat. The basecoat and/or clearcoat may be derived from the curable film-forming composition described above.Also provided are coated substrates in which the curable coating compositions or the multi-component composite coating compositions described above are applied to a substrate and cured to form a cured coating.Further provided is a pigment comprising particles having a mean particle size less than 100 nm and comprising 1 to 99 percent by weight metal oxide wherein the metal is selected from zinc, titanium, cerium, manganese, bismuth, copper, zirconium and iron and 1 to 99 percent by weight silica. These particles may be used in the curable film-forming compositions described above.