The use of Biosan® anti-bacterial products does not exclude the necessity to clean and disinfect on a normal and regular basis. Grind out fine cracks in V-shape up until 0.5cm wide. If depth is more than 50% of the width, apply a back filling. The crack edges must be primed with Parafix®. Hard PVC needs to be primed with Primer 44HS. (30% dilution) Metal or glass should be primed with diluted Noxyde®.