My concern with acid dipping is that it thins the sheetmetal. I could be mistaken, but acid dipping race cars to reduce weight was common back in "the day". What's currently being done may not be the same as then, though. I'm pretty sure Foose uses baking soda blasting. Small media insures low damage to the sheet metal plus it's environmentally friendly. Gotta keep the tree nazi's off yer back.[img]/phpBB/images/smiles/icon_wink.gif[/img]