Residues that are cationically polymerisable suitable for use as part (A) of the liquid composition, are well known and may be, for example, a cationically polymerisable heterocyclic compound such as a cyclic ether, e.g. an oxetane or a tetrahydrofuran or a cyclic ester, e.g. a lactone or an episulphide, e.g. ethylene sulphide.