Bostik Bituminous Black Paint is a protective coating for external waterproofing and weather protection for use on ferrous and non-ferrous metals, concrete, roofing felt, fibre cement, corrugated iron, asphalt and wood. It can also be used in silage pits. This bituminous black paint is ready for use and thinning is not necessary. Apply at least two coats by brush 24 hours apart.