A bonding process comprising:a) applying a composition comprising a storage-stable solution of:at least one cationically polymerizable monomer and a polymeric thickener of the formula: ##STR7## where n is an integer and R1, R2 and R3 are H; orR1 is methyl and R2 and R3 are H; or R1 and R2, are H and R3 is methyl; or R1 is H and R2 and R3 are methyl,the composition further comprising a thermal or p