[Excaliber]

I got a call, some years ago, from a friend with a Cobra (FFR) that wouldn't start, he was stranded at the gas station. Dead battery he thought, as did I. Jumper cables hooked up and we still had nothing. Connections looked good and tight, clean. Eventualy, after much head scratching, we cut the insulation back on a factory type battery cable. Nothing but "green" inside! I was surprised how far back under the insulation the corrosion extended. Re-did the cable connect, started right up.

Copper is like that, you can cover it, insulate it, seal it, heck it might still start the corrosion process!