Pretty much everyone makes a clear sealer,but sealers aren't designed to go over bare steel.If you bust an edge they can usually handle that,but large areas of bare metal are taboo.If you really want to do it,after it's stripped and the desired pattern is etched in the metal,use the clear sealer or topcoat clear immediately to seal it from humidity.Then mask off whatever and put color where you want.I strongly advise against doing it,but it's up to you.