Toolcraft poly isobutylene self welding repair tape toolcraft mt 1910 p when layers of the tape are stretched and laid in contact with each other they merge together to effectively form a solid rubber part p p the conformable black non adhesive poly isobutylene based tape has strong elastic qualities and backed by a thin film that can be stripped off cleanly and easily p toolcraft mt 1910 poly isobutylene pib auto welding repair tape black 19mmx10m