Everbuild Black Jack 902 Bitumen and Flashing Primer is a thin black primer used to give a key, prior to applying bitumen paints, roof coatings and flashings. Suitable for use with all bituminous surface coatings including concrete roofs, floors, cementitious screeds / renders, bitumen felt and weathered corrugated iron or steel. This primer can also be used to cover asphalt, mastic and wood. Fast drying and solvent based for exterior use only. Coverage is 4-6m² per litre depending on porosity of substrate, or 11m² per litre on non-porous surfaces.