I haven't, but I've heard second hand stories that it will corrode aluminum over time. I have had good luck using RMI-25 and distilled water. This has cleaner, conditioner and surfactant. And water is more efficient transfering heat than ethylene glycol, so no anti-freeze unless you know it's going to freeze outside.
Hey Chad, just a thought, but why not add an electric 'pusher' fan on the front side of the radiator to supplement the flex fan.
