Posted by Marty on Thursday, January 09, 2003 at 5:25PM :
In Reply to: Paint Question posted by mrmc on Thursday, January 09, 2003 at 5:20PM :
Self etching primer is used on bare metal.
Metal needs to be etched with acid or metal prep prior to priming. You can avoid this step with some primers if they are self etching. Often used on Aluminum but Zinc Chromate is better.