I have posted a new progress update video on my R2-D2 build. Please check it out below. for painting the dome I used Rust-Oleum Automotive Steel spray paint and for the blue portions of the dome I used Rust-Oleum Cobalt Blue spray paint. I 3D printed the eye and holoprojectors and used Rust-Oleum Filler Primer to fill in the grooves of the 3D print. If you have any questions about my build, please feel free to leave a comment below.