Glittering car magnets
We recently needed to temporarily decorate our parade car. We bought giant car magnets and went for it! This same technique could be used for advertising on car magnets. There is nothing like glitter to catch attention and turn heads.
We were only going to use these for 1 day so we mixed up a fast batch of epoxy to go over the letters. If you wanted to use this on your car for months and need to seal it then we would recommend Clear Guard (below). Be sure to test, but it should work fine with any of the solvent resistant glitters that we sell.