Quote Originally Posted by MaK2000 View Post
I lapped my U120 Extreme over the weekend. I used knife oil to make it easier and not leave scratches. I used 220, 650, and 1500grit wet dry paper. But it is not a mirror like these. If I start to do it dry it leaves scratches. Do I need higher grit sandpaper or will it finish like a mirror if I just keep doing it? Will it even make a difference between a flat copper finish and a mirror copper finish?
mirror != flat

flat is what you want