I've been given an airbrush kit, from someone that paints ceramic statues and stuff like that using enamels. They recommended a product to add to the paint called Penetrol (for airbrushing and regular brushing). According to google it can be used as a primer before the paint or it can be added to the paint mix. here is a link: The Flood Company Australia Has anyone used this or anything similar on a Transformer? Its an Australian product, I'm not sure if they export it. Hakka.