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If your already-painted walls have glossy paint, scuff the surface with 220-grit sandpaper or its equivalent before applying primer and paint. For all other paint sheen finishes, clean the walls and repair any spots that need it. Remember to protect the places that you don't intend to paint.

You can hide wallpaper seams when painting by applying joint compound over them and then sanding thoroughly until smooth. You’ll want to apply two layers of compound, allowing for four to eight hours between coats. Do a light sanding between coats and then after the final coat is dry. Once the compound dries completely, you can begin priming and painting the wall.

A whole-house color palette often has between five and seven colors. Those include the trim color that appears throughout your home, a foundation color for your main living areas, secondary colors for each bedroom, and accent colors, which are close to your foundation or secondary colors. Smaller homes under 1,000 square feet may just have four or five colors, while larger homes can have ten or more and still look cohesive.

One gallon of paint can usually cover up to 400 square feet. Therefore, painting a one- or two-car garage door typically requires one gallon of paint, which should give you enough for the two to three coats experts recommend for this job. However, if you're painting a lighter color over a darker color, you might need more. Using primer can decrease the total number of coats of paint you need.