mixture of cationically polymerizable components having at least two epoxy resins, said at least two epoxy resins including a first epoxy resin polymerizing at a slower rate and having a higher neat viscosity than at least one other epoxy resin present, (ii) a blend of radically polymerizable components; (iii) a polyol; (iv) at least one photo-generating acid precursor; and (v) at least one free r