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Autosol is a good polish and made in Germany so may be available locally. It really depends on whether you are cleaning it or removing pitting. I tend to buy decent to begin with. If The pitting is...

Try googling "buffer compound suppliers Europe ". I just did and came up with multiple suppliers.

Here are a couple links might help. The Caswell site has good information on the grits and using buffers

http://straightrazorpalace.com/workshop/50158-walking-w-b-though-buffers-illustrated.html...