Koster is a one part polyurethane based, liquid applied waterproofing material , after applying the material cure with moisture air from a seamless, elastic, crack bridging and walk able membrane has high adhesion strength to concrete, masonry, plaster mortar any many similar products . Koster is a resistance to water contact , weather conditions ,sunlight. Abrasion (foot traffic) and thermal and thermal variation (-30 to +800c service temperature ).above water proofing shall provided with enough UV layers for claimant conditions.