A painting system includes a mobile robot including a frame, wheels connected to the frame, and a motor configured to move the wheels to position the mobile robot. A paint container is mounted on the mobile robot and configured to store paint. A robot arm includes a first end mounted on the mobile robot and a paint applicator arranged at a second end of the robot arm. The paint applicator is in fluid communication with the paint container and includes one or more nozzles to spray the paint onto a surface.