I have a recent (2009-2010) MIM Jazz Bass whose body cavity is covered in the same paint as the surface of the body, including the clearcoat. I guess this is actually pretty typical. I think there is already a layer of conductive paint under the color coat; however, if I did choose to shield the cavity myself (either with copper tape or with paint), would it be beneficial to Dremel off the paint covering the cavity first? My reasoning is that neither the tape nor the paint would adhere to the wall and floor of the cavity very well with the clearcoat in place. Actually, even if I were to do something like this, I'd sooner do it to a cheap Rondo than to a Fender, but that's a separate question, really. I of course do not want to damage the surface finish at all.