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You can use RTV to seal up any holes made in the wiring insulation. That, or F-4 tape should suffice. If possible, though, heatshrink tubing is preferred over either of these solutions.
My personal preference is to strip off the insulation from the signal wire in question, solder the other wire to it, then seal up the stripped part. Usually, I can get the splice near a wiring connector, which means I can take the wire's pin out of the connector and use a section of heatshrink.
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