[Vwdiesel] Hand lapping

[Libbybapa at wmconnect.com]

I remember a discussion a while back about hand lapping.  The gist that stuck 
with me was:  Find/acquire a VERY flat surface.  Put paper on it.  Put valve 
grinding compound on it.  Lap surface flat.  Could someone go into a bit more 
explicit detail.  Is there a particular kind of paper to use?  Is there a 
particular kind of compound to use?  Is there a "better" method for lapping?  Ins 
and outs please.  Thanks in advance.
Andrew