Craig & Rose 1829 Internal & External White Gold Metallic Paint 100ml Tester Pot. This white gold water-based internal & external paint is used to create a decorative metallic finish to plaster wood & metal work. It's washable which is great for removing small marks created during everyday life. Simply apply each coat with a brush or roller & leave for 4 hours to dry. Covers up to 10 m² per litre on average.