Sand paper, by its very nature makes scratches… that why they use water on the final finish and color sanding to be a lubricant. all of the micron pastes have a lubricant in them… you would not want to use water ( wet-n-dry sandpaper ) on your W.E. They sell these pastes that are designed to be applied directly to a W.E. strop… 0.5 micron is the same as using 50,000 grit sand paper. 1.0 micron is the same as using 10,000 grit sandpaper. you can buy micron paste in any flavor ( grit ) 1.5 micron, 2.5 micron etc. and it has the lubricant already in it. dry sand paper is not the way to go if you are looking for a mirror finish.
I know I did not answer your question, I was just trying to help you avoid a problem.. they also sell lapping tapes with an adhesive back .