I use the 3m painters tape the 2 inch wide, the best they have its around 9.00 a roll but leaves a sharp edge. I put one 3 inch or so piece on top of another and then fold it in 1\2 that way when I cut out the flame I have a right and left 1\2. I use a xacto blade and a cut out board from the hobby store to cut them onheck that looks great not even a limo imo, looks more like one of those million dollar or more rv's...looks cool though! maybe do another one the same way but make it have some pop outs on the side..would look cool. also, what are you using to mask out the flames? just frisket paper and tape or?