Blue Line Acrylic Paints optimised for brush Used primarily for cockpit interiors, but also for lower surfaces of Polish AF reconnaissance aircraft between 1919 and 1939 also Also known as „High Speed Silver”, overall colour of early-postwar RAF jets (till mid-1950s). Later (till 1966) used on lower surfaces also Also known as „High Speed Silver”, overall colour of RAF trainers until 1966 (with yellow or day-glo orange elements)