Mike,
On this windscreen, I dipped it in future, then after it dried, I masked off the outer surface and sprayed Tamiya smoke through an airbrush to the inside. I may have been able to smoke it first, as I think some guys do that, but I didn't. I only wish I had put on a few less coats on the smoke so it was a little lighter, but I was generally pleased with it and it's still translucent.
Good Luck,
-Art