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I can't use automotive Wet/Dry sandpaper for too long. It wears out really quickly.

No, does that make a difference? never thought of that

My experience is that it doesn't even feel like it's doing anything. I takes FOREVER for the slighest sign of colour to show up.
I'm getting tired of spending like $10 each time on sandpaper...

Is it just me or is the lapping stone basically useless. I have one and it takes me FOREVER to remove the smallest amount from either sides of my 4k/8k. It almost feels like it's not doing anything....