FWIW, it sounds like you're already commited but...
I would STRONGLY recommend that you try this method on a test piece first. There is definitely a learning curve to this technique, and unless you've at least tried it out once on something else, ANYTHING else, I think you're going to be unhappy with the results - especially the way you're trying to accomplish it. Don't let all the efforts you've invested so far (time, money and energy doing the prep work) go to waste. If you cant find something to try it out on first (a junkyard door, fender, even an old washer or dryer, ANYTHING...) then do yourself a favor and just work on one section of the car. Hood, fender, even the rear deck lid in your case. Personally, I think a fender is the true test as it has both horizontal and vertical surfaces, creases and curves - a little bit of everything.
