EVO-STIK TECHNIK OPF adhesive is for fixing all types of ceramic floor and wall tiles including large format porcelain, vitrified & natural stone tiles onto many typically encountered surfaces including plywood and impermeable substrates. EVO-STIK TECHNIK OPF adhesive forms a strong bond with concrete, cement-render, concrete block-work, tile backer-boards and brickwork. This adhesive is polymer modified to give improved flexural strength, and is suitable where under-floor heating is installed. EVO-STIK TECHNIK OPF adhesive can also be used to fix tiles directly to fully braced and secured plywood timber panels and is sufficiently water-resistant to be suitable for interior / exterior use, in swimming pools and locations which are subject to persistent dampness, e.g. showers, saunas, wet rooms and bathrooms