you can buy an inexpensive home powdercoating system. it's electric, has ground, and i am sure you can get clear. you will need an old electric oven to bake it. a toaster oven will be o.k. if the parts are small. a clear spray paints is wet and has an evaporate. this will likely start small amounts of rust on the part before it evaporates. in time, you will see this rust growing under your clear coat. this will not happen with powder coat becuase it is dry. (but then in time, all metals will rust a little. even aluminum rusts - VERY - little.) check for a home powdercoat system on ebay if interested.