@Classi Seal is a flexible, self-adhesive waterproofing strip that’s typically used around baths and shower trays to create a watertight seal between the wall and the edge of the tray or tub — especially useful before tiling. So yes, if you’re doing a proper bathroom installation or refurbishment, you should use something like Classi Seal or an equivalent.Here’s when and why you’d use it:✅ When to use Classi Seal: • Installing a new bath or shower tray, especially if you’re tiling the walls afte