I've been experimenting with a new technique.....shading panel lines, take an erasable pen, made by Papermate.  They come in black, blue and red, you just take it through the panel lines, it will not work on rivets, but perfect for panel lines, and if you mess up, no problem, it can be erased.  This must be done on a flat surface, before gloss coating and decaling.  When you erase you may notice a tiny amount sheen where you did it, but gloss coat will cover that right up.  This is perfect for doing clean planes like an F-15, and dirty planes like an F-14.  For an F-14 dirty look, let the pen dry about half an hour, then take a damp paper towel and rub lightly in the direction of airflow.  Make sure that it is  done before any gloss coating, and if you are using an enamel gloss coat, make sure the plane is sitting level, or it will run, if you are using future, or an acrylic gloss coat it works fine.

Josh Henderson