View What Takes Off Spray Paint From Metal US. The most effective way is to scrub the paint off using a paint you need to at least remove any loose paint that's not attached securely to the metal by sanding or scraping it off. But if you want a smooth look.
But it can also vary on the material of a product.
Its too difficult to remove spraypaint so you will have to paint over that. Apply a wire brush and scraper combo to the metal first to remove all loose paint and rust or to scuff up the surface of aluminum or galvanized metal. But if you want a smooth look. I let it dry for 3 days however, when i was putting the leather cushions back on chairs they got a lot of nicks in the paint.