Description: Clear Waterproofing Membrane is a two part membrane you are required to purchase CWM Part 1 to use this product. This is matched to CWM Part 1 10ltr  if you are trying to achieve a Gloss finish on a balcony for external application, if being used internally or on vertical surfaces you may desire to increase to part to between 1:10 to a 1:5 ratio additive percentage is increased and you will require more to match CWM Part 1 Clear Waterproofing Membrane Part 2 - 1L (CWMP21L)