Abstract: Methods and devices for coating a composite substrate. A desired design can be applied to at least a portion of a substrate's one or more surfaces by indexing the substrate, a coating apparatus, or a combination thereof, during or between application of one or more contrast coatings. The term indexing refers to changing the position (e.g. angle, tilt) of the substrate and/or the coating apparatus, the speed of such positioning, the rate at which the coating is applied, or some combination thereof. By such indexing, the pattern (4A-C) applied to the substrate (2A-C) can be varied.

Abstract: Described are sealing primer compositions that can be used to reduce paint defects such as pops or vapor boil on painted plastic substrates, as well as related methods for sealing plastic substrates, and sealed plastic substrates. Sealing primer compositions of the invention include a functionalized polydiene polymer such as a hydroxylated or other functional-group-containing polybutadiene polymer.