4500 Series Hot Rod Sparkle & Cosmic Sparkle Colors. Pearl Flakes in a transparent base. Apply as a pearl mid-coat over a base color or directly mix with other Auto Air Colors to create unique custom color creations. Hot Rod Sparkle are large pearl-flakes, Cosmic Sparkle are smaller pearl-flakes which are the same found in many O.E.M. automotive colors. Hot Rod Sparkle White is a universal pearl-flake that is actually transparent and, as such, color-keys with any base color. Hot Rod Sparkle White can simply be applied over any AutoBorne Sealer for a quick, easy yet brilliant pearlized finish or applied as a tri-coat over any color for added pearl-pop.