His pictures are typically painted with oil or acrylic, using paint brushes and sponges, and depict scenes of rural town life, topical commentary, and some religious subjects. His illustrations for the collection of Henry Lawson's poems show keen powers of character observation combined with an obvious wit. Hart was also a sculptor, working with welded steel, bronze and ceramics. Pro Hart was known for his novel techniques including "cannon painting" and "balloon painting", and in 2002 was using his own DNA as a mark of authenticity in his paintings. Retrospective application of a DNA mark is available for older Pro Hart paintings. An example of the Pro Hart Cannon painting was when a commercial on television was shown for stain resistant carpet, covering the entire carpet with his unique painting style. For most of his career Hart was dismissed by many critics as a mere showman, with his art often judged as populist and derivative, and not good enough for serious critical attention. Barry Pearce, the head curator of Australian art at the Art Gallery of NSW said that comparing Hart with the artists whose work normally hangs in the gallery was "rather like Slim Dusty being compared to Mozart". Hart considered his critics to be a part of the "art mafia" and noted that he achieved his success without any help from the arts establishment.
Beliefs
He frequently addressed political themes in his artwork. When asked about this subject, he stated "If I said what I thought sometimes, I might get sued so I paint to show what is going on, to bring out the truth and make people aware". The painting AboriginalLand Rights is from Pro Hart's "masks" period. This painting highlights his conspiracy ideas with regards to land rights. The scene has a map of Australia with the Aboriginal Flagover the top. The people in the background "playing the communist cards" have Illuminati logos on their ties. In the foreground are a group of Aboriginal people, perhaps negotiating their rights.
Pastimes
He collected vintage cars and motor cycles, and invented many kinds of engines and machines. He enjoyed pistol shooting, reading the Bible, and organ music. He was the proud owner of a Rodgers electric pipe organ, which was said to be the largest of its kind in Australia. This was installed in his gallery, a step which considerably enhanced its value as a Broken Hilltourist attraction.
Awards
He was made a Member of the Order of the British Empire in 1976. In 1982 he received an Honorary Life Membership of Society International Martinique for outstanding artistic achievement. He received an Australian Citizen of the Year award in 1983, and was known for his charitable work and generosity.
