Patent ID: 7632547

Claim:
A method of applying a clearcoat coating to a substrate, the method comprising: combining a photo curable composition comprising: urethane acrylate; a first photoinitiator that absorbs light in a first spectral region such that more photocuring of the photocurable composition occurs at a first position near a surface of the coating than at a second position further away from the surface of the coating; and a second photoinitiator that absorbs light in a second spectral region such that photocuring of the photocurable composition occurs throughout the coating, with a thermally curable clearcoat composition to form a dual curable composition, the dual curable composition is curable by both illumination with light and by exposure to heat; applying the dual curable composition to the substrate to form a coated substrate; illuminating the coated substrate with light for a sufficient period of time to cure the coated substrate into a photo-cured coated substrate; and applying heat to the photo-cured substrate for a sufficient time to cure the photo-cured coated substrate into a clearcoat-coated substrate; wherein the clearcoat coating has a ratio of the integrated area under the vOH, vNH peaks (3700 to 2750 cm −1 ) of the infrared spectra to the integrated area under the vCH peaks (3125 to 2650 cm −1 ) less than about 50.