Personally, I don't think that they'll be able to enforce it. With all of the "do it youself" paint systems that are coming out (Dpli-Color and Sherwin-Williams both have them now), nevermind that availability of tractor paint easily and all of the equipment from various sorces, I don't think that the industry will allow the EPA to put them out of business. Besides, the only way that they'll be able to truly control it would be to eliminate any available paint, including spray cans, fom being sold to the general public.