Painted circuit devices, methods, and systems are disclosed. In some implementations, painted circuit devices are created using multiple layers of electrically conductive paint. In one aspect, a painted circuit includes a substrate and one or more paint layer applied to the substrate, where the one or more paint layers each form an electrical component of the painted circuit. A given paint layer of the one or more paint layers can include a conductive paint formulation having a resistance that is defined by a concentration of conductive material that is included in the conductive paint formulation and a thickness of the given paint layer, and lower concentrations of the conductive material included in the conductive paint formulation provide a higher resistance than higher concentrations of conductive material.