If it’s wet …
Pro MBR XD from Proma is a high-performance integral membrane used for both interior and exterior waterproofing under tile and stone installations. This product creates a thin, continuous barrier that protects against water penetration in wet areas, such as tub and shower surrounds, kitchen and food-prep areas, laundry rooms, balconies or terraces over unoccupied spaces. Pro MBR XD is also suitable for submerged applications, such as pools, spas, hot tubs and fountains.