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when solder wicks in to a wire it creats a weak point in the wire as well, that is why they recommend not solder filling larger cables any more and instead recommend a multi sided crimp, the problem with crimp taps is the moisture that can get in there and corrode the wire, a dap of dielectric grease takes care of that, the insulation is then cut and weakend as well the way around that is to use silicone II calk, or other silicone sealent that is safe for copper, normal silicone calk has an acid base that will eat away at copper so make sure it's safe for use on electrical connections, it will keep unwanted moisure out and add some protection around your connection.
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