CYCAT XK 406 N is a phosphoric acid derivate. CYCAT XK 406 N increases the crosslinking speed of heat curing coating systems based on e.g. phenolic/‐epoxide resin combinations. A significant improvement of adhesion properties is often seen in connection with the use of CYCAT XK 406 N. Furthermore, the use of CYCAT XK 406 N often leads to an improved sulphur staining resistance of interior can coating systems based on phenolic/epoxide resin combinations.