Coating system

A coating composition containing a crosslinkable coating composition comprising:

• ingredient A that has at least two protons that can be activated to form a Michael carbanion donor;
• ingredient B that functions as a Michael acceptor having at least two ethylenically unsaturated functionalities each activated by an electron-withdrawing group;
• ammonium carbamate (H2NR8R9+—OC═ONR8R9), wherein R8, R9 are each independently selected from hydrogen, a linear or branched substituted or unsubstituted alkyl group each having a number of carbon atoms selected from the group consisting of 1 to 22 carbon atoms;
• 1 to 8 carbon atoms;
• and 1 to 3 carbon atoms;
• and
• a catalyst system selected from the group consisting of (i) a catalyst system of diethyl carbonate, quaternary ammonium hydroxide or quaternary ammonium alkoxide, ethanol and optionally 4-6 wt.% water relative to total weight of the crosslinkable coating composition;
• and (ii) a catalyst system of carbon dioxide, quaternary ammonium hydroxide or quaternary ammonium alkoxide, ethanol and optionally 2-4 wt.% water relative to total weight of the crosslinkable coating composition.