I can answer that one.....spray paint!!! Only mine were silver by accident, when I knocked a spray can off the top shelf in my garage. It punctured and did the pinwheel thing on the floor. By time I threw the garbage can over it, several of my models received a shiny coat of silver paint.[]. Fortunately, none were jets, and none of the paint reached my vehicle which was parked in there........ Guess where my spray paint is stored now!!