Wiring question

What is the suggested wire tapping method. Will be installing heated grips and they supply inline wire taps that you use a plier to push close over the lead wire.

I would think that would cause issues and high resistance down the road causing the wire to rust rot. I am thinking about exposing the lead wire wrapping the hot wire around soldering it and using liquid tape then regular tape.

Tapping into 12v wires on my Kodiak 450

Thanks
Brian