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Chalk paint can be applied without sanding first. Keep in mind that while there are a lot of chalk paint color options available, there aren’t as many choices as latex or oil-based paint.

You can also learn how to paint furniture without sanding using a liquid deglosser, sometimes referred to as liquid sandpaper. This can remove any old paint, gloss, or varnish, without the need to manually sand. Apply the deglosser using a cloth, then wait for the chemical to penetrate through the surface. Once it soaks through, you should be able to wipe away the residue with a towel. 

You should always use a primer before painting over wallpaper to help the paint adhere correctly and get a good finish. Not all wallpaper can be painted over, so do a test patch in an inconspicuous area before painting an entire wall. If the primer and paint don’t adhere, you’ll need to remove the wallpaper, prime the wall, and then paint.

It’s a good idea to sand your porch before painting. This will remove loose or chipped paint and debris, and give you a cleaner surface so that your new paint goes on smoothly. But if the existing surface is in good condition, it’s not necessary to sand your porch before you paint.

To estimate the cost to paint interior walls, multiply the square footage by the average price range to paint interior walls, which is $2 to $6 per square foot. For example, a 12-by-12-foot room with 8-foot tall walls is 384 square feet, meaning that the cost to paint the room will range from $768 to $2,304. Painting the ceiling and any trim will add to the overall cost, as will any repairs.