I forgot to mention about the chemical leaching you asked about. if you do feel it will leach chemicals you could also check for the marine forms of that type of paint, which is commonly used on boats or anything that stays in water. try contacting someone at a company like dupli color they should know more about the leaching propertys than anyone else would. they might even be able to reccomend a protective sealent you can apply or another product to use. Also try contacting to company who made the light to see what kind of paint they used when they made it. HTH
let me know how it turns out!