Abstract: A method of painting a substrate coated with an electrocoat, wherein the electrocoat includes an average surface roughness equal to or greater than 3 microns, includes applying a two-component sealer onto the electrocoat to form a film having a thickness of from 5 microns to 20 microns. The two-component sealer is partially cured by application of heat to a gel content of from 10 to 50 wt. %. Thereafter, a topcoat, typically including a basecoat and a clearcoat, is applied onto the two-component sealer. Both the two-component sealer and the topcoat are completely cured by application of heat.

Abstract: This invention, therefore, relates to the field of polyurethane coatings for use in automobile basecoat/clearcoat systems. In particular, this invention relates to the discovery that incorporating a long-chain carboxylic acid of at least 50% by weight of the carboxylic acid component used to make polyester resins which are further incorporated into polyurethane resins provides basecoat composition exhibiting low temperature flash characteristics. These low temperature flash characteristics are exhibited even where the basecoat is deposited at 50-90% relative humidity.

Abstract: This invention, therefore, relates to the field of polyurethane coatings for use in automobile basecoat/clearcoat systems. In particular, this invention relates to the discovery that incorporating a long-chain carboxylic acid of at least 50% by weight of the carboxylic acid component used to make polyester resins which are further incorporated into polyurethane resins provides basecoat composition exhibiting low temperature flash characteristics. These low temperature flash characteristics are exhibited even where the basecoat is deposited at 50-90% relative humidity.