QUOTE (Tom Johnson @ Nov 3 2009, 10:00)

The drawing begins with a 3-mil, frosted sheet of mylar drafting film taped onto a sheet of foam core board. The foam core board allows the drawing to be moved as necessary for best access to the area being worked on. The mylar surface responds extremely well to pencil. I use .3mm 2H and 4H lead in a mechanical pencil. The first layer of mylar is only used to draw the perpective grid for the subject.
when you say "perceptive grid" do you mean you are only laying out the ground plane in the chosen perspective?
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Once it is complete and registration marks are added, a new sheet of mylar is taped over it and the actual drawing begins.
is this new sheet of mylar frosted as well? It can be seen through well enough over the perspective plane/ base drawing?
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When the draft drawing is complete, a new sheet of the same type of mylar is taped over it and an inking is made using a 0.18mm Rapidograph. ( 0.12mm for tiny bits)
again, all of these layers of mylar are of the same material, frosted mylar, same 3-mil thickness?
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Next it's off to printer to have a litho film-positive produced. You must specify that the finished piece of film is made as clear as possible since it will become the medium for the painting. At times, I've had to have two or three films made before getting an acceptable one.
I'm assuming the litho film positive is on a clear sheet of acetate?
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The film is now flipped over (wrong reading) and taped onto a fresh piece of foam core board and the airbrushing begins using gouche. The advantage of the film is that if a mistake is made, it can simply be washed away with a paper towell and a touch of saliva. This process can can repeated over and over without anyone ever knowing you messed up. Generally, the basic painting is all done on the back side. When it is near complete, the film is flipped back to the front and fine tuning begins. Color and value adjustments are made without disturbing the core painting on the back side.
Additional layers of film can be added as overlay paintings as needed. For example, graphics, color schemes or component parts such as different engine covers.
Hope this helps.
again, at the film positive stages, these are all clear acetate layers?
Before you answer, I simply want to thank you, Tom, for that information. I am grateful and acknowledge your giving.
Chad ;)