This is a pack of x2 MX Flexi Seal Strips. Transforms any flat top shower tray or bath to a tiling upstand option. Creates a watertight seal between the tray and the wall. This MX Flexiseal product is a professional waterproofing solution applied by hand to the wall facing sides of shower trays or baths prior to installation. The flexibility of the product makes it equally suitable for the new build, repair or renovation. This MX Flexi Seal is for use in Bathrooms, Showers, Kitchens and other areas where a waterproof seal is essential. Flexi Seal Strip Installation Instructions: Before You Start: Please note that although these instructions are comprehensive, we always recommend that a technically competent installer undertakes the installation. Tools and Materials Required:.