Paint with Precious Metals like gold, and white gold! Apply over fired glaze to add brilliant accents that’ll make your project look like a million bucks! Metallic Overglazes for the brilliance of gold and white gold, and lusters for a rainbow of hues like the pearl of an oyster shell. Overglazes are an accent product that are applied over a fired glaze and then kiln fired to a relatively low temperature. They are sometimes referred to as "third fire" glazes.