What does this mean? Radiator question

Evan you might try water wetter, made a impact on my brand x engine, 406 in an early coupe.
http://www.saferacer.com/red-line-oil-racing-water-wetter?gclid=CPfLnOahmMYCFVGCfgodeyEA6Q

I've heard good things about those additives. I may have to give them a shot.