I do not know of the mylar transfers, however, they would most likely have to be clear coated to be fuel proof.

If you are going to clear coat, you might as well draw your panel lines and rivets on the covering. I use Helix brand felt tip markers. The colors are available in 0.1mm, 0.3mm, 0.5mm and 0.8mm The black ones are also available in the same sizes. A set of 4 cost me about $11 at Staples. If you don't have a Staples, almost any drafting supply house or blueprint copying place should have them (or something similar ). Those sizes should cover just about any size line and rivet you would need.

If you look at panel lines on a real plane they are not black. They are usually a very dark, "muddy" brown/black in color.

In any case, the lines and rivets will need to be clear coated to prevent them from coming off.

Hope this is of help.

If you find the mylar transfers, please post the information to the board as there seems to be a lot of people who would be interested.