Flex-Mend Underbelly Tape Adhesive cloth is a strong repair fabric made of the same material as the Polyethylene Underbelly. The advantage of this tape is that it has a strong adhesive backing to the material that can be applied directly to problem areas. The reason this tape is a top-use product for this application is that most tapes have a difficult time adhering to the Polyethylene cloth. Duct tape and other iterations of "strong" adhesive cloths will stick, but only temporarily. Instead of making frequent repairs to your underbelly, use a more permanent solution such as Flex-Mend.