Solvent-borne coating compositions, coatings formed therefrom, and methods of forming such coatings

A method of forming a coating over at least a portion of a substrate comprising:

• applying a coating composition over at least a portion of a substrate, the coating composition comprising:
• (a) a carboxylic acid functional polyol polymer comprising an acid value within a range of from 30 to 120 mg KOH/g and a hydroxyl value within a range of from 60 to 150 mg KOH/g;
• (b) a melamine-formaldehyde crosslinker reactive with the carboxylic acid functional polyol polymer of (a), wherein the melamine-formaldehyde crosslinker comprises imino and methylol groups that together comprise 10 to 35 mole % of the total functionality of the melamine-formaldehyde crosslinker, and wherein the melamine-formaldehyde crosslinker comprises butyl groups and isobutyl groups that together comprise 5 to 70 mole % of the total functionality of the melamine-formaldehyde crosslinker;
• (c) an acid catalyst;
• and (d) a non-aqueous liquid medium;
• and
• curing the coating composition at a temperature of 90° C. or less to form a coating over at least of portion of the substrate.