I recently put new underlayment under the rear seat. It was made of some sticky tar/asphalt stuff on one side and the other side was made of recycled like grey fabric and thread stuff. I put the sticky tar like side down against the floor and the fabric like side up against the bottom of the seat. The problem is that I want to remove the new underlayment to look at the date code on the floor but the underlayment tar side is so sticky it cannot me removed without destroying the new underlayment. Is this how these underlayment are supposed to be and is this how the factory peices where made? I tar side also had plastic on it which I peeled off, was I supposed to leave this on so it is not so sticky? Maybe this pieces are just not made to ever be removed... Or was the tar side supposed to point up towards the bottom of the seat? I also have flowmaster mufflers relatively close to the floor, is there any chance of this stuff catching on fire? The directions said I could lay either side down which is ridiculous because one side is black sticky stuff and the other side is grey felt stuff!!!!!