STICKFLEX PY Peel Stop is a self-adhesive, polyester reinforced 120g SBS elastomeric modified bituminous waterproofing membrane. Both surfaces of the membrane are covered with film. To be used as a peel stop membrane to resist wind load on upstands, skirtings, perimeters and penetrations. STICKFLEX PY Peel Stop is suitable for use in Neo-bitumen and Excel FM Flame Free warm roof waterproofing systems.