What kind of sandpaper do you use to remove old finish from brass fireplace?

I have used 320 grit all-purpose sand paper. But if you find this isn't removing the brass, you can go to a 240 grit or so. Remember you are only scuffing the surface, it is just to remove the gloss so the primer has something to adhere to. I have used 320 grit all-purpose sand paper. But if you find this isn't removing the brass, you can go to a 240 grit or so. Remember you are only scuffing the surface, it is just to remove the gloss so the primer has something to adhere to.