Hi Troy!
The panel lines are painted with a flat black "wash": its more or less a drop of black acrylic flat paint and 8 drops of thinner. Once you have your wash mixed apply with a pointed brush, the wash must run throught the panel lines, don“t worry if the wash runs out of the panel line. Some times you have to do this two or three times, depending how deep you want the color.
When the wash is dry remove the excess with a q tip with a little polishing compund (i use tamiya fine compound).
Corvette letters where made:
1. Semi gloss black tamiya acrylic paint.
2. Coat of Ts-13 clear thorugh the airbrush to protect black paint.
3. Another "wash", this time made with red oleum artist paint and spirit.
Apply the red wash, since oleum paints dries in two or three days you have plenty of time to remove excess, in fact it's even easier to do this the next day because the paint is like jelly, again with a q tip this time sunked in spirit, or threbentine remove excess carefully (you don,t want to remove all the paint =)). I chose olium paint because the pigment covers much better that the acrylics wich are a bit transparent. For me the result is better.
Hope this helps! =)
Len, Tom, thanks for your interest and comments!