I would recommend using a schluter product. This is what we typically see in commercial and residential(contractor built) projects. They have a bunch of different profiles. I believe you can get it at any tile/stone shop that isn't a big box store.
This is also the same stuff I had my dad install over the summer when we retiled his entry/guest bathroom. Some of their product is expensive, but I don't think the trims are that bad and they look great!
I believe for the trim you are wanting, you would want the Rondec-DB profile.
Last edited by Baffan; 08-30-2012 at 04:50 PM.
Reason: additional info
you could just use some sandpaper to polish the edge of slate. start with 120 or 220 grit with a little water and work your way up to 500 grit. just try on a scrap piece, you might get lucky. may be the cheapest option at a few dollars.
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