Re: Roberts RT1 radio
I'm pretty sure that the main ingredient in Xerapol, as recommended by David in post 6, will be cerium oxide. If so, it can be bought economically as a dry white powder which when mixed with a little water becomes a smooth paste.
People have written books about abrasives but the key thing about cerium oxide is that the particles are smooth rather than jagged lke those of silicon carbide. Both of these are extremely hard abrasives but the oxide has less of a tendency towards scratching the surface to which it's applied.
Alan
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