I've got some that I made in the 1980's that are still perfectly fine. I don't leave them outside, in the truck or just tossed in the back of the pickup... and they last forever. I've cut the shrink tubing off to check on the cable over the years, but it's always fine. I only check them after about 3 or 4 years, now. Shrink tube 'em back up and keep using them. Nothing fazes these things. Pine pitch wipes right off with WD40 and a rag.