Standard heat shrink tubing is pretty handy stuff, and the addition of an adhesive lining can make it even more so. Typically made from cross-linked polyolefin, which is stronger than PVC and does not burn like PVC, this tubing, with its heat-activated adhesive, provides a tight seal against water, oils, acids, and sunlight. The tubing’s major markets are marine, RVs, and campers, but I like it as a general-purpose heat shrink because of the better seal.

The main suppliers are Ancor, 3M™, and Raychem (Tyco).