Buy the 'sapler pack' of wet/dry at the automotive dept at Wal-Mart.It goes up to either 1000 or 1500 grit, Start with 400 and work your way up shoe shining like Ken mentioned. If you want to finish up with semichrome, sure, why not, but if the inside of your slide is not as smooth and shiney, i.e..like Dave is describing the inside of an engine, after a few rounds it'll be scarred up again.