Demand published several books on his artwork. His work was usually illustrating a narrative written by others. The Big Race was published in 1955. He created 128 charcoal drawings to illustrate the history of automobile racing from 1894 to 1955. Subsequent books were on airplanes, trucks, dirigibles, tanks, paddle-wheel steamers, motorcycles and the Mercedes car. The most popular of the books, however, is Conquerors of the Air: The Evolution of Aircraft, 1903-1945.
Before his death, Demand was a founding member of the Automobile Fine Arts Society and routinely exhibited at Pebble Beach at the time of The Concours d’Elegance. He has also shown at Meadowbrook and numerous one-man shows, primarily in Europe. He is in numerous collections, both private, public and corporate.
Throughout his life, Carlo continued to provide illustrations for publications. These ranged from Motor Trend to Auto Motor und Sport. Auto firms that he has done work for include Daimler Benz, Volkswagen, Auto Union, Ford, Renault and Volvo. He is on of the best-documented automotive artists ever. The bulk of his work has appeared in print. The only exception is the gouache work on pre-1960 auto racing.