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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.

One gallon of paint covers about 400 square feet. Assuming that you have four equal walls that are 8 feet high, a 12x12 room will need one gallon of paint per coat. The number of coats you need will depend on the condition of the wall and whether you’re painting over an existing color or starting fresh.

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.

Once you prep a house for exterior painting, painting with a sprayer can go quickly. Spray painting results in a thin layer of paint, likely taking multiple layers to get full coverage. You can expect the spray paint job to take at least one day, including dry time, but it can take longer depending on how large of a home it is and the weather conditions.