think about it logically
your roughing it up, then smoothing with finer and finer paper. your desired goal is a smooth finish
well im just skipping straight to the smoothest paper. which is what your going to end up doing anyway. in the meantime i'd be smoothing, you would have spend time just grating away metal until you decide "right now i will smooth"
i've done it with the past 3 machines and had excellent results. if you compare the finish on mine to your pictures you can argue the finish on mine is better and even from edge to edge. until you try it yourself i wouldnt slate it, first lapping job i did was with my thumb and palm of my hand ... had terrible results, because it was an uneven surface. the worktop i have is level and not course, the pictures i took were in the utility room which worktops above the washing machine is just a cheap n nasty one to cover the tops of the machines and sort clothes.
the reason i lapped it like this is because a friend of mine worked in a place where they machined down piston heads for very precise pumps. they put the round sheets on a turntable like unit and the heads are placed against them and spin whilst water trickles over them. they are sanded for best part of an hour. the finish on the metal was like a mirror or the platter of a hard drive, so smooth its unbelievable.
he aquired the silicon carbide sheets and we both attacked our own heatsinks. try it yourself before you slate it because its different to what you have tried. i think the results i got speak for themselves and im not going to try and convince, im simply sharing my experience for others to try.
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