Painting coke bottle can be difficult. Any paint that is fuel proof may dissolve the bottle. I've not had good luck with Rustoleum or Krylon for fuel proof. The Lustrecoat dissolves the clear plastics.

One technique to try might be painting it with rustoleum, and then putting on a couple thin coats of finishing resin. That will add a nice high gloss, and its fuelproof to boot.

Brad