Hardening of bonding systems

A formaldehyde-based and/or a polymeric isocyanate resin system composition for bonding ligno-cellulosic materials to form panels and/or shaped products, which contain a resin hardener, also referred to as resin catalyst,

• wherein the hardener is in the form of a salt formed by an acid moiety and a base moiety and
• wherein either the acid moiety is the residue of a volatile acid while the base moiety is the residue of a less volatile base, or the base moiety is the residue of a volatile base while the acid moiety is the residue of a less volatile acid and the more volatile moiety activates the hardening of the resin system.