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I spoke to a mate who has experience in lapidary work, reckons Cerium Oxide powder bought from lapidary suppliers at a reliable. 3 of a micron is the good gear, and is treated the same as the other...

Wow that's what I call chasing an edge!. 5. 25 and. 1 of a micron. Go get em, let us know how it all shaves

Euclid has it right, mixing the powder with oil, it does permeate into the balsa. As far as powder versus spray or crayon. I find the powder goes a very long way. I bought a jar containing 100 grams...