This is acrylic on metal. This is a detail of an acrylic painting on a large metal sawblade. I had old photographs of a sawmill but I needed reference photos of a tractor to complete the setup. I remember asking around and I found a working tractor that an elderly gentleman kept in his yard. Not only did I get photos, I got lots of information, and an elderly gentleman got to show off his pride and joy to my children and me.