I don't think it has anything to do with anything other than inferior rubber products. My heater hoses are supplied from the original manufacturer, but my radiator hoses were NAPA, and they were constantly covered with the slime. I NEVER covered ANY rubber in my car with that silicone shinny slimy stuff like Armor-All, or any other product that contained silicone!!! It's simply antifreeze that's leeching through the rubber.
Find a better supplier...............or nos.
