A few years ago I tooled mechanic wrenches on several belts for a tool company. The finish I settled with was CRYLONE auto paint.; HI-TEMPT EXHAUST CROME.....silver paint is oily and never seems to dry. I sprayed in a small cup and applied with a small brush. You could spray in your case. I sealed it with a wood finish called VARATHANE. This was an exhausting project.; The finish sealed the project and stoped any bleeding of the paint. This was in 1983. They are still my clients; and I use VARATHANE on all of my buckles to date......still have the prototype. still looking good............DOC.