Obaproof slate seal 800 is a specially formulated colourless protective coating with added Ultra Violet (UV) additive for treatment of interior and exterior concrete surfaces against scratching. Obaproof slate seal 800 suited for slate, quarry and paver tile, stamped concrete and concrete tile. All surfaces must be dry, clean free from dust, grease and efflorescence.Repair chip-off or concrete surfaces and make sure surface free of water. Apply by brush, roller or spray.For normal application 2 coats are sufficient. Coverage about 7 square meter /litre.