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Yes, you can paint over already painted metal, but—before painting—you’ll want to use sandpaper on the area to achieve a rough surface. This helps prevent the paint from peeling or flaking. Remove damaged paint with 120-grit sandpaper. If the paint is in good condition, use 240-grit sandpaper. Brush off any dust before applying the primer. 

Glossy-sheened paints work best in rooms where moisture and humidity are factors. Satin and semi-gloss paints do not absorb moisture like other types of paints due to their hard finish. These paints are also easier to clean.

You shouldn't paint a metal fence. Painting doesn't necessarily damage a corrugated metal fence, but these types of fences are meant to flex, and paint can easily chip and break off. Latex paints can address this issue, but those tend not to be very weather-resistant. Certain paints can trap moisture in the corrugation, which can rust the metal and lead to corrosion. And finally, if you paint a copper fence, it won't patina, which is one of the main reasons people buy copper.  

Latex paint is one of the best paint types for textured walls. This water-based paint is fast-drying and has low volatile organic compounds (VOCs), making it safer and more convenient for painting walls that require several coats of paint. 

If you’re painting exterior walls, you can also consider using oil-based paint, but keep in mind that it takes much longer to dry and can slow your project down considerably.