How you do that????

I looked at the "tire stickers" also and liked that idea , but this was a much cheaper alternative! I had some plastic/vinyl spray paint and some wrapper stock. So I took some paper, did a pencil rub of one of my repro Polyglas's and transferred that on to the wrapper stock and cut it out with a razor blade to make a stencil. (crude but effective) Just centered the stencil and sprayed. Looks pretty convincing from a few feet away and undetectable when rolling down the road. The only give away is the ride and sidewall/tread pattern.

what product do you use to give the black wall a semi sheen ? does it affect the lettering in any way ? how do you clean the sidewall ?

We have a guy here in Phoenix that has a vulcanizing process to put blue and red lines on tires. It's a portable setup, does the tires on the car. Everyone I've talked with that had the process done to their tires have no complaints.