Home / Waterproofing / Classi Seal Waterproof Flexible Upstand (2.5m) Classi Seal Waterproof Flexible Upstand (2.5m) £24.99 Order by 3pm, get it tomorrow! Earn 24 points worth £0.24 with this order Description Self Adhesive Strip - No Mess, Easy to install. For use in Bathrooms, Showers, Kitchens and other areas where a waterproof seal is essential.