Sometimes you want to spare your expensive 1K - 3K stones getting too much wear from the blades that need a lot of honing.
I've honed 1 or 2 razors but huge amount of woodworking tools and knives on a high grit sandpaper (say 1000 - 2000) before moving to higher grit stones.
Just glue the paper into flat heavy surface to make sure it is 100% flat. Piece of glass attached on a thick flat wood, marble or anything such will do. I also clamp the base on the table to prevent it from moving during honing process.