This might be a stupid question but here it goes. If a guitar is finished in charcoal black/faded grey or any of the "black tinted" colors would it be at all possible to just sand it down a little bit and then apply another color tint as that is technically the same process that you would use on a clean top?
Or do you need to sand it all the way down and seal and start over?
What about the SE veneers? Would a bit of sanding on for example a brown quilt top make it possible to turn it grey/black?
The original stain color will influence the new color. It's tough to go from dark to light.
The veneer on an SE is pretty thin. If you try to refin one, be sure not to get carried away with sanding.