I need to make two acrylic shower trays less slippery for the users. These have the standard sort of dimple pattern. In the USA I have often seen shower trays with strips of a rough material on them that is rather like waterproof sandpaper. I have searched on the net and found various types and makes available in the UK. If anyone has practical experience of this I would like to hear about it. Obviously the surface needs to be well cleaned before application. The other concern is if it is practical to apply it to a tray with raised dimples so that it stays put. I am aware that there are various mats available but these have not proved satisfactory because of the difficulty in keeping them clean. TIA
Peter Crosland