Catalyst composition and extended pot life thio ream-based compositions

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The present invention is directed to catalytic compositions and to curable compositions containing them. Catalytic compositions of the present invention typically comprise : (i) a reactive compound comprising at least one group selected from acid-functional groups and/or groups that may be converted to acid-functional groups; (ii) a metal compound; and (iii) a compound different from (i) and (ii) that catalyzes an addition reaction between an ethylenically unsaturated compound and a thiol. Curable compositions according to the present invention comprise : (a) a polyene, (b) a polythiol, and (c) the aforementioned catalytic composition.