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Wow.

What a difference. The 240 grit only took a minute to remove the stain and the crud. It feels very different now. After lapping on the 600 grit it is now flat.

I also lapped my belgian...

I managed to find a store that carries it. Funny enough, it is one of those stores I usually avoid because they carry either cheap junk or overpriced good stuff.

I bought a couple of pieces of 240...

Damn.
And to think I trusted the guy behond the counter.
Is there an online store for buying 3M paper?
Because sure as hell I don't find it at any of my usual hardware stores.

Well, the paper is red. It's called siawat, and made in Switzerland. Our local hardware store carries it.
It's a quality store that gets visited by all professional carpenters, masons etc, so I am...

Yesterday I tried a pyramid with the Norton 4K and the Belgian blue. My 4/8 has not yet arrived.

I lapped the 4K on 1000 grit wet paper. The white stone is now stained red, but I assume that...