White polyurethane primer with excellent verticality and sandability, ideal for MDF doors and kitchen doors. Applied by spray gun, airless, or airmix. Fast-drying, reduces MDF absorption. Fast drying and easy to sand. Harden with NC942 (standard) or NC900 (slower, more elastic) at 50% by volume. Reduce with standard PU thinner ND5920 or ND4291 up to 20% by volume. The best option for achieving a smooth finish on MDF surfaces.