am going to paint the blue Mellotron with a gun... It is going to be some shade of white again. Spray cans are fine for the inside of the cabinet, but if you are going to put effort into cleaning up the outside and fixing the dents, crapped up corners and edges, then for me, a gun is the way to go. It is faster and you have more control. Spray cans are way too uneven when painting large flat surfaces
Or to give it that genuine Rick Wakeman feel, paint it with a flame thrower. It's very quick and easy, but do it outdoors. The fumes and overspray are not good indoors.