component b does not have to contain the exact amount of water required for complete curing of the first component a as calculated by formula x for example it can contain a greater amount of water such as twice the amount or more than twice the amount or less water can be present in the second component b than calculated by formula x in this case the rest of the water required for curing must be absorbed from moisture in the air it is advantageous if at least the amount of water required to completely convert the polyaldimine to polyamine is present in the second component b that is the second component b preferably contains at least as many moles of water as equivalents of aldimine groups are present or in other words the second component b preferably has at least one molecule of water per aldimine group the water in the second component b either can be present as free water or it can be bound to a carrier but the binding must be reversible i e after the two components a and b are mixed the water must be available for the reaction with the aldimine groups and the isocyanate groups suitable carriers for component b can be hydrates or aqua complexes in particular inorganic compounds with coordination of water or that have bound water as water of crystallization examples of such hydrates are na 2 so 4 u00b7 10h 2 o caso 4 u00b7 2h 2 o caso 4 u00b7 u00bd h 2 o na 2 b 4 o 7 u00b7 10h 2 o mgso 4 u00b7 7h 2 o other suitable carriers are porous materials that trap water in voids these.