I just bought a new plastic tank for my L and a set of vinyl adhesive graphics to keep the stock look. I've read before that the graphics will not stick due to gas fumes permeating through the plastic. So, I decided to do a little research. According to a highly respected gas tank refinishing company, it is true that gas fumes will leech through the plastic pores and destroy the adhesive. Some graphics have small holes punched into them to help release the fumes. This will make the graphics last longer, but they will still eventually fail and turn yellow. I figured that the best solution would be to have a barrier on the inside of the tank to stop the fumes from penetrating the plastic. After a LOT of researching different tank sealers/liners, I found a product called Phenol Novolac Epoxy Gas Tank Sealer from Caswell, Inc. (http://www.caswellplating.com/aids/epoxygas.htm) They claim it works well with plastic tanks as well as metal tanks and outlasts everything else. I talked with a company rep about my possible application and he said it would work great. Since I don't necessarily believe sales reps, I contacted the respected tank refinishing company and asked their opinion. Low and behold, that's what they use. In the 5 years they have been using it, they have not had 1 problem. They also said that this sealer would fix the problem and stop any fumes from escaping. I am now waiting for the sealer to arrive and look forward to trying it. After hearing from an independent frequent user of the product, I'm very confident it will work. Hope this helps anyone who is thinking about putting graphics on their tanks.