For butt splices, I've had good luck covering the splice with shrink wrap tubing. It not only weather proofs the splice but adds another layer of structural integrity to the splice as well. I buy it from West Marine who have economical assortments or you can buy by specific size - I suspect that Radio Shack or auto part stores offer it as well. Just don't set the TM on fire while applying heat to shrink the tubing! - camp2canoe
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