Ca glue is, in its uncared state a series of monomers that are triggered to chains of acrylic polymers by a catalyst. In the case of ca, this is water, without water ca will not cure, this is why applying ca in cold sheds in winter does not give a good finish. If you apply copious amounts of ca and end up with little bubbles of cloudy grunge, this is actually uncured monomers encapsulated with acrylic polymers, the cure on the outside has prevented the chemical reaction in the centre. The thing that controls the cure time of ca is the amount of acid that is added to the liquid, the more acid, the slower the set. One accelerator for ca, or one that removes the acidic delaying effect is a solution of baking powder finely sprayed on to the curing glue.
I would have thought that since oak is so acidic, wetting it may well be counter productive and may well delay the cure. Other things such as the age of the glue may well be contributory factors. As has been suggested a sealer may allow the ca to cure but it isn't something that is normally needed for other species, or indeed other oak.
