Gamblin FastMatte Alkyd Oil Colors are formulated to give oil painters a fast-drying (18-24 hours in thin layers) oil colour with excellent working properties and permanence. The balanced colour palette allows for great colour mixing potential. When used for underpainting, the matte surface allows for maximum adhesion with subsequent layers. Because of their low to moderate oil content, they are suitable for underpainting when painting ″fat over lean″. All colours (with the exception of White) are transparent to semi-transparent in nature, which can create the tonal range important for underpainting techniques.