Dulux Undercoat - All surfaces (Solvent Bases)Universal undercoat for primed and sealed surfaces Product Description Dulux Universal Undercoat is an intermediate coating for use under decorative topcoats, for interior and exterior use. Application Description Brush, roller or conventional spray 1. Preparing the Surfaces Suitable for cement plaster, gypsum plaster, concrete, fibre cement, PVC, galvanised iron, ferrous and wooden surfaces provided that appropriate preparation and priming is carried