I'm not completely sure exactly what you mean by "natural metal finish", but an inexpensive way to create the effect is Model Master spray "metalizer", which buffs up to a really nice finish. You can get "aluminum", "stainless steel", "gunmetal", "titanium"...any number of shades....all buffable ( note: they also sell a "sealer" - DON'T use it or you'll flatten... 'matte'... out the finish ) - HTH - Craig in Daytona