MFM Building Products 50W36 Peel & Seal (36 in. x 33.5 ft.) is a self-adhering, 45-mil thick white aluminum waterproofing membrane designed for low-slope roofs, flashing, and repairs. It features a UV-resistant aluminum surface and rubberized asphalt, providing a durable, flexible, and easy-to-install barrier, commonly used on mobile homes, porches, and trailers.