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You'll need at least two coats of paint when painting your stair railings, despite some manufacturers' claims of single-coat coverage. This is necessary mostly because there are often many corners and details that make it difficult to cover all surfaces evenly with a single coat. Adding a second coat evens out the finish and provides added durability.

The best type of paint to apply to stainless steel is epoxy paint. This material is also popular for painting over concrete and other floor surfaces because it creates a tough, durable surface. Keep in mind that the epoxy paint curing time is three to seven days, but refer to the manufacturer’s instructions for specific wait times. 

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.  

The biggest issue with painting your interior walls with exterior paint isn’t the way the paint looks or performs—it’s the lack of ventilation. The higher quantities of VOCs in exterior paint will have a harder time dispersing in an enclosed space, so do everything you can to direct them out—like turning on a fan and opening your windows and doors. Afterward, you can simply prime and redo your walls with interior paint, and no one will know the difference.