Polyurethane wood glue for waterproof (D4) (flat) bonding of almost all types of wood. It is applied in non-load-bearing wooden structures, in various forms of wood joints, such as finger joints, assemblies, notches and tenons, dowels, and springs. Suitable for application in both indoor and outdoor spaces, such as in shipbuilding work, facade carpentry work, and sandwich panels. It is also suitable for less easy connections (e.g., unplaned wood). It is applied only if one of the two surfaces is porous (highly absorbent).