Hi,
I used a can of Krylon Webbing Spray. They are small cans, but one can easily covers one pinball.
The results are the same as the original.
I don't recall where I found my cans for sale, however, I just looked on the net, and a company called CASWELL Australia sells cans for $15. It looks like they stock silver, white and gold.
I used the silver with great results, it is a very dark silver.
I was told that Spotlight, or art suppliers sell it (although when I looked I was not able to locate any).
I don't know anything about dealing with the company CASWELL, but the Krylon spray works really well.
Good luck
Gordo..