Hi I’ve just finished making a bonnet scoop out of a spare piece of galvanised metal, does anybody know what sort of preparation I would need to do to paint over it?
If it’s bare steel, just sand with 180, epoxy or DTM primer, block and paint. Most vehicles in the 90’s were built with galvanized steel, especially GM.
If you’re doing filler work, you’ll need to see if the filler will stick to it after you’ve sanded it and then decide if you will prime first before filler or not. There’s a lot of things we don’t know about your project.