Coating composition comprising one or more polythiols and one or more polyisocyanates and a latent' base catalyst which is activatable by moisture, wherein the equivalence ratio NCO : SH is between 1 :2 and 2:1. The latent catalyst is selected from the group of oxazolidine, aldimine, ketimine, and enamine. The latent catalyst is present in an amount of up to 20% relative to the weight of the curable material. The composition further comprises one or more photoinitiators in an amount of up to 4% relative to the weight of the curable material.