I'm no expert, but are the different grit papers from the same manufacturer?
Go for the 1200 grit, I have read somewhere else that a 1000 grit quality sheet is much better than a 2000 grit that can't be counted coming from a respectable manufacturer (using the 1200 grit and slight pressure).
I'm going for my last lapping, and I got much better results from using 400 grit paper with some metal polish than from 1000-1500-2000 that must be non quality sheets (non polish).
So I'm going to get some 1200 grit now, and post the results.
But hey, if you can reflect distant objects from the surface, and its even, use it.
Much more important that the surface is flat, and that is without it being mounted to the water block (if it's a cpu block. Mounted to the rest of the block, should probably have a bow to it)
I haven't seen the video yet, but I have to run out the door now
Oh, and you should have some lubrication ofc, there are different approaches out there.
Here is oneEdited by NorxMAL - 5/4/11 at 2:36am