A warning about Evans Waterless Coolants

I run regular water/antifreeze mix. 50/50 for winter running/winter storage (it covers most winter here, although we have seen it get below -40 with windchill, that generally doesn't apply to engines). In summer I go to a much lighter 30/70. This summer will be the first time I try straight water with maybe a water wetter type additive as the track requires. So I'm always keeping an eye stuff like this. Still trying to decide which additive to run.

Thanks for the info.