Alkyd Primer Undercoat is a professional quality oil based primer suitable for preparing all bare timber surfaces. With high opacity and film build.It has has deep penetrating and sealing properties, provides excellent inter-coat adhesion and is easy to sand. Ideal for use on wooden doors and windows, this product also may be used as an undercoat over previously primed timber. Also suitable for primed metal surfaces, plywood, paper faced wallboard and hardboard.