Originally Posted by pbasil1
Guys, starting with higher grits paper will take FOREVER to lapp the IHS. The real purpose of lapping is to insure that the surface is FLAT, and not concave/convex, which would make for a horrible contact between the IHS and the Cooler surface. Starting with 2000grit paper will not sand down the surface flat.
Start lower, even 600 may be a bit fine for some HSF or IHS surfaces (I don't think that I would start below 400 though). Starting lower will add time, in some cases a considerable amount (1-3 hours). It is worth doing it right the first time, just remember what your after: mirror image and a "glass-like" appearance.