From 1963 to 1965, he made geometric paintings with sprayed automobile paint. (borghi.org)
He has worked with other mediums and materials, including two - dimensional paintings made with automobile paint, tied urethane foam sculptures (both in the 1960s), and crushed metal and melted Plexiglas sculptures (in the 1970s). (artlyst.com)
He also appropriated the acidic, artificial colours of automobile paint, pioneering a change in the use of colour in sculpture. (artsy.net)