Sandtex Smooth Masonry Paint 5L Slate Grey Exterior Brick Stone Concrete This paint will cover up to 16m2 per litre. Coverage will get reduced on very textured surfaces. Rainproof in 1 hour . Dirt Resistant paint. Durable protection for 15 years. Suitable for most sound, dry exterior surfaces including render, roughcast, pebbledash, concrete, building blocks, facing bricks and previously painted surfaces. Breathable.