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There is no substitute for solder and heatshrink or chem-seal.
Crimp-on taps work, but if you can't seal them, the wires will corrode. Since electricity only travels the outer-most diameter of a cross section of each thread in a wire, when corrosion occurs, the wires effectively have a reduced surface area per strand, and thus create impedance compared to the rest of the circuit.
The second-best thing to do would be to apply the crimp-tap, then be generous with some hot glue in the area, making sure to liberally seal the wire's connection and tap.
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