So I'm a little different. I went to the hobby shop and rather than use paint, I picked up one of those kits to make stained glass. You know, the kind that come with plastic beads that you put into a frame, bake it in the oven and the beads melt into the frame.
Obviously, I chucked the frame, filled the FORD letters with the beads and baked them as per the kit's directions. Best part is you can pick the color of plastic to use.
I did these about 15 years ago in white and they have yellowed a bit but still look presentable.