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In most cases coarser DMTs or Lapping stones are used, no Bench stones so i wouldnt recommend a 220 or 1000 grit Benchsstone...a cheaper variant before buying a DMT is Sanding Paper which is usable...

Those stones are generally fine cutting and smoothness generating stones, if the surface is without any break outs or unregular areas everything should be fine...i never experienced bad issues with...

Its as already mentioned a Hybrid Coticule, which in most cases is most likely called a Les Latneuses layer....there are very different layers withing the Belgium region, also many mixed or hybrid...