3M™ Scotchrap™ corrosion protection tapes 50 and 51 are tough, polyvinyl chloride (PVC) tapes with high tack adhesives that resist corrosion of metal piping systems above and below ground. Both tapes apply over a wide temperature range and are-resistant to impact, abrasion and punctures. coat the pipe or other metal surfaces with 3M™ Scotch® rap™ pipe primer before wrapping with Scotch® rap™ tapes 50 or 51.