Sto's StoGuard Transition Membrane is flexible and it's able to accommodate a wide range of conditions and building tolerances where peel and stick membranes may not work. This membrane is virtually impermeable to the passage of liquid water and can withstand up to 6 months exposure (when protected with Sto Gold Coat, Sto EmeraldCoat or Sto AirSeal), 3 months if protected with Sto VaporSeal or Sto ExtraSeal.