My mum has a strange shaped walk-in shower and wants to make it non-slip. I can't find a mat big enough or any site that will make one to fit. Non-slip strips are a possibility - I've found a site that sells them that says they will outlast mats. Has anyone used a paint-on product, does it work and where do you get it from?? I've now spent 3 hrs doing the research and have finally turned to MN