I have a Pierce Arrow with a gasoline tank that was treated by RENU before I bought the car and the liner has now failed. It is cracked and brittle and pieces of it clog the gas line when the car is running. The liner cannot be dissolved because it is baked on. I called RENU and asked how to remove it and they told me heat but would not disclose the needed temperature. I would need to ship the tank back to one of the company offices and the closest one is several hundred miles away. Has anyone had success in doing such a removal? I'm reluctant to send it to RENU given the fate of their first liner and the treatment that I received by their customer service rep.