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Jeremy Pavleck over at Cool Tools recently recommended Rescue Repair Tape. It is a fusing silicone repair tape that has umpteen uses. It can even be used as a temporary patch for leaking radiator hoses. I recommend buying a roll for at home, and one for each of your vehicle tool kits.
Jeremy is correct! This stuff is beyond awesome. It is waterproof. It insulates from electricity. It is heat resistant. It is easily removable but doesn't come off unless you want it to.
I have used it to improve grips on firearms (it is tacky but doesn't stick to anything). It is perfect for "taping" down a tac-light's pressure pad switch on a long gun. It can easily be removed leaving no residue behind, but holds up to the hottest barrels.