Ressi TA 250 Ressi TA 250 is a thin set waterproof tile adhesive designed for the fixing of thin glass and mosaic tiles at a bed thickness of 2mm and below. This tile adhesive is specially formulated for applications in wet areas where thin tiles to be applied. Ressi TA 250 is an extremely versatile and durable and a highly polymer modified tile adhesive for internal and external applications. Ressi TA 250 can easily be applied using the application spectrum as defined by BS EN 5385-1