Rubber Dressing Concentrate is for use in Body Shops and other areas where silicone can be a problem.  Instead of using silicone, RDC uses humectants and polymers to create a deep, rich, shine on tires and trim.   As the name says, it is a concentrate.  Dilute 3:1 with water for a high shine and 4:1 for a medium shine.  This makes it a great substitute for silicone based products which are much more expensive to use.