Blackfriar MDF Primer Undercoat all in one primer and undercoat designed for use on MDF. White finish, perfect for pre-decoration, easy to apply and dries quickly so you can prime and undercoat and finish all in one day. It can be over coated with a choice of finishes including gloss, emulsion and stains. Coverage, 14m sq. Per litre, touch dry in 1-2 hours re-coat able in 4 hours and hard dry in 3 days.