MagnaClaw™ White Primer/Undercoater is a HAPs free, 550 VOC compliant, fast dry, easy sanding pre-catalyzed primer/undercoater. It is specially formulated for use as the first coat under M.L. Campbell^® Pre-catalyzed Pigmented Lacquers. It exhibits very good adhesion on wood, particleboard and hard boards. Also, has good holdout over porous surfaces such as soft wood and untempered hard board. Sands very well to produce an excellent base coat with outstanding holdout of topcoats. Especially developed for filling the open pores on MDF board.