The invention relates to a cationically curable composition with at least one cationically polymerizable component, a first photoinitiator releasing an acid when irradiated with actinic radiation of a first wavelength .sub.1, and a second photoinitiator releasing an acid when irradiated with actinic radiation of a second wavelength .sub.2, wherein the second wavelength .sub.2 is shorter than the first wavelength .sub.1, and wherein the second photoinitiator, after irradiation of the composition with actinic radiation of the first wavelength .sub.1, shows an absorption of actinic radiation of the second wavelength .sub.2 in the composition that is sufficient to activate the second photoinitiator and fix the composition. Furthermore, a method is described for the joining, casting, molding, sealing and/or coating of substrates using the cationically curable composition.

The present teachings generally provide a system comprising a pultruded profile and a two-part system with a first component including one or more epoxy resins and a second component including one or more phosphate esters such that mixing the first component and second component forms an activatable material that activates at a temperature of about 0 C. to about 50 C. The activatable material is extruded onto the pultruded profile such that residual heat from pultrusion in the pultruded profile activates the activatable material.

A two-component curable resin composition for hydrogen gas sealing contains the following agent A and agent B. Agent A is a composition containing an epoxy resin as a component (a) and a catalyst as a component (b). Agent B is a composition containing an organic polymer having two or more hydrolyzable silyl groups in one molecule as a component (c) and a curing agent for an epoxy resin as a component (d). A cured material of the two-component curable resin composition for hydrogen gas sealing has a sea-island structure.