For exterior use on all masonry including stone, cement render, brick, concrete etc. Not suitable for areas which are permanently wet. Before application treat any algae with Ecos Long Life Instant Algicide and allow to stand for 4 days. For soft and crumbling substances pre-treat with Ecos Stabilizer. Best results usually achieved with 2 coats. Coverage is 9m²/l per coat. White sample pot available.