since the polymerization is induced by humidity, it should be stored dry and cool. Put it in a small plastic bag to avoid condensating water when you take it out of the refrig. Before fitting the two parts together it is helpful to breathe upon both surfaces. The small amount of humidity helps hardening. Be careful when you want to glue in the near of optical parts, the glue is rather volatile and the vapours leave white residues in the surrounding which are hard to remove.