After the war Comotti became a test driver of the new Talbot-Lago T26C. He also made some Grand Prix start with that car in 1948. In 1950 Comotti became a test driver for Scuderia Milano and also made his first World Championship Formula One Grands Prix at the Italian Grand Prix. He made his second and last World Championship Grand Prix start at the 1952 French Grand Prix, driving a Ferrari for Scuderia Marzotto.