Re: Buff a "faded" SG?
I think you had it right in the opening post. T-Cut. But I'd use the neutral one, which is kinda like Brasso, not the coloured one. If you have any open pores that retain the dried white residue, simply wash the guitar down with Prepwash/Prepsol, which is a wax and grease remover used in the auto paint industry to remove any oily residues before painting. It is harmless to plastics and other sensitive items and it evapourates almost as fast as it is applied. In fact ideally you'd clean the guitar with such a product first, then use the T-Cut, then Prepwash again if there's any dried white residue to get rid of.
I have used these products for years, from when i used to do a lot of auto-refinishing right through to guitars, amp chasis and pedals. If you really want to get a shine, you can use something like 3M Hand Glaze after the T-Cut. Brasso will work in place of T-Cut, and even toothpaste.
I have a Highway 1 Strat which had the dull nitro finish, and it became shiny on the forearm cut in just a few hours, so I simply used T-Cut and Hand Glaze to put a shine over the entire body. It looks a whole lot better than a dull finish with random shiny areas.