Coating compositions were recently patented. The compositions feature at least one hydroxy-functional polyester with at least two hydroxyl groups per molecule. At least one of the hydroxyl groups is a tertiary hydroxyl group, wherein the polyester has a weight average molecular weight Mw of 200 to 5,000, and the polyester contains 10-90 wt-%, relative to the total quantity of polyester, of at least one acid ester group comprising a tertiary hydroxyl group.