High solid coating compositions

Coating compositions comprising:

• A) least one hydroxy-functional polyester with at least two hydroxyl groups per molecule, wherein at least one of which hydroxyl groups is a tertiary hydroxyl group, and the polyester has a number average molecular weight Mw of 200 to 5000, and contains as a structural element 10-90 wt-%, relative to the total quantity of polyester, of at least one acid ester group comprising a tertiary hydroxyl group and of the following general formula I ##STR1##
•  wherein R₁ is a single bond or a C1-C6 alkyl group, R₂ and R₃ mutually independently mean a C1-C4 alkyl group,
• B) optionally, at least one additional hydroxy-functional binder other than A) and
• C) at least one cross-linking agent which is capable of entering into a cross-linking reaction with the OH-groups of components A) and B.