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To test the stone I would try this.

Get a cheap wood plane from a DIY store. And remove the blade.

Then get your arkie flat on some wet and dry paper. These stones are hard as hell and it might...

yeah but I only have the information I've picked up on here, and my knowledge I've got from my own arkie. Mine been a trans black finisher. It took a fair amount of reading to begin to understand my...

Depends on the stone.

If it looses it's grit than it's probably 1K-1.5K

If the grit doesn't budge and it's that hard that it begins to take a glassy sheen then it will continue to build that...