A surface-protective coating composition, comprising: a first component comprising: a dendritic polymer having 32 to 128 peripheral cross-linkable functional groups; optionally, an acrylic compound comprising 2 to 6 peripheral cross-linkable functional groups; optionally, a plurality of metal oxide nanoparticles optionally encapsulated in a polymer comprising a cross-linkable functional group and/or a fluorosurfactant comprising a cross-linkable functional group; optionally, a sterically hindered amine light stabilizer; optionally, a UV absorber; optionally, a cross-linking catalyst; and a first substantially anhydrous solvent in which the above materials are dissolved or, in the case of the nanoparticles, are dispersed; and, a second component comprising a cross-linking agent, and a second substantially anhydrous solvent which may be the same as or different from the first substantially anhydrous solvent, wherein: the first and second components are mixed together to form the coating composition wherein the first and second substantially anhydrous solvents contain less than 500 ppm of water, preferably less than 250 ppm of water. a first component comprising: a dendritic polymer having 32 to 128 peripheral cross-linkable functional groups; optionally, an acrylic compound comprising 2 to 6 peripheral cross-linkable functional groups; optionally, a plurality of metal oxide nanoparticles optionally encapsulated in a polymer comprising a cross-linkable functional group and/or a fluorosurfactant comprising a cross-linkable functional group; optionally, a sterically hindered amine light stabilizer; optionally, a UV absorber; optionally, a cross-linking catalyst; and a first substantially anhydrous solvent in which the above materials are dissolved or, in the case of the nanoparticles, are dispersed; and, a second component comprising a cross-linking agent, and a second substantially anhydrous solvent which may be the same as or different from the first substantially anhydrous solvent, wherein: the first and second components are mixed together to form the coating composition wherein the first and second substantially anhydrous solvents contain less than 500 ppm of water, preferably less than 250 ppm of water. a dendritic polymer having 32 to 128 peripheral cross-linkable functional groups; optionally, an acrylic compound comprising 2 to 6 peripheral cross-linkable functional groups; optionally, a plurality of metal oxide nanoparticles optionally encapsulated in a polymer comprising a cross-linkable functional group and/or a fluorosurfactant comprising a cross-linkable functional group; optionally, a sterically hindered amine light stabilizer; optionally, a UV absorber; optionally, a cross-linking catalyst; and a first substantially anhydrous solvent in which the above materials are dissolved or, in the case of the nanoparticles, are dispersed; and, a second component comprising a cross-linking agent, and a second substantially anhydrous solvent which may be the same as or different from the first substantially anhydrous solvent, wherein: the first and second components are mixed together to form the coating composition wherein the first and second substantially anhydrous solvents contain less than 500 ppm of water, preferably less than 250 ppm of water.