No such thing as real none conductive water based coolants. Its none conductive when made and for about 48 Hours in you system. then that changes.
As soon as you add dyes its conductive , as soon as you add biocide its conductive. If your after real none conductive fluid put your hands in your wallets and hand me over £80 per 1 Kilo (not inc P&P) and ill send you some M3 fluids how ever i very much doubt you will do that. If you after real top of the range none conductive fluids then its £140 a kilo.
Dyes are fine for up to 9 months but as said some people never change them out and wonder why they systems are screwed. The same all so goes for tubing as the plasticizer leaks into the system over time this can build up on blocks on certain types of tubing.
Some cheap colour tubing is crap and it cracks at the compression fittings and can leak. Ive seen it my self several time when testing tubing.
Every thing has its plus and minus points but what you choose is up to your self. There will be haters on both sides of the fence whom are ready to throw stones over the fence just because they have nothing better to do.