Colourless polyurethane insulator designed for MDF, applied by spray gun, airless, or airmix. NI14988P perfectly fills the MDF substrate, ensuring a smooth, plain surface before the application of white PU or PE primer. Harden with NC942 (standard) or NC950 (higher solid, more elastic) at 50% by volume. Reduce with standard PU thinner ND5920 or ND4291 up to 20% by volume. Novalk NI14988P prepares MDF surfaces for optimal primer adhesion, contributing to a refined finish.