Pro Tapes Pro Flex Patch & Shield Tape is an all weather, flexible butyl patch and shield repair tape. Its one of the heaviest, most aggressive sealing tapes available. Use to deal with leaks in virtually all roofing and metalized surfaces. The tape is easy to apply to any clean, dry surface. Also recommended for use when stopping leaks on mobile homes, RVs, rail cars, trucks, vans, garden sheds, gutters, tarpaulins and some unpressurized piping. Pro Flex is UV resistant for added longevity, VOC free, and conforms easily.