[Durt]

How old are they? Mine began discoloring almost immediately. Lynn Park warned me, and suggested a white spray paint applied with a q-tip. I used a brush, but that paint began to peel & brown within days. I recently used the white industrial enamel I used on my garage floor (gettin' desperate here,) which still wasn't dry after a week. I drove to the Historics in Monterey, and a couple of tires looked like 'spin-art' after the 650 miles. Sigh.
Cleaned them up last weekend, but they are already a light caramel brown. I'm going to try one, maybe two more coats, and then I'll live with whatever they wind up looking like.
Lynn P. said that the reaction of paint to rubber was nasty, but this has been ridiculous. I've thought about a clear sealer, but I'm afraid the discoloration starts at the rubber.
At the Peterson Museum Shelby birthday bash, there were some 100 original Cobras. Every one that had Blue Streaks or Cobra Tires was in some stage of touch-up or decomposition.