If you have a model that’s about to be thrown away, don’t do it! Instead, go to Home Depot or Lowe's and get a can of gold or silver spray paint. Be sure to get the ultra-glossy stuff! Put the model on some old newspapers and spray-paint it. It takes only a few minutes to paint the entire thing, and usually less than ½ an hour to dry. You might have to turn it up-side-down to complete the paint.
The finished product will have a whole new meaning, and might even be worth hanging on your wall! Check out this painted Enterprise-D: