Plastic switch-plate covers typically come in two colors: gloss white and ivory, which often looks simply like a muddy version of white. These aren't the best colors to highlight a designer paint job, and some homeowners spend 10 times the price of generic plastic plates to get ones that look more interesting. Painting your existing plates is a money-saving option; to get the best results, avoid making rookie painting mistakes.
Take Them Down
A common rookie mistake is to leave your plates in place and paint them when you're painting the wall. This is a recipe for streaks and other defects, and if you do this, you may commit a second mistake by failing to scuff and prime first. Taking the electrical covers down before painting them is a simple procedure that involves removing one or two screws, and it allows you to paint the drywall underneath while you're painting the rest of the wall. Prepare each plate for painting by rolling a strip of duct tape, sticking the tape to the plate and then affixing the plate to a sheet of newspaper. Now the plate will stay put without your having to hold it.
Scuffing and Priming
Before you tape the switch plates to newspaper, clean each one by immersing it in a solution of 1/2 cup of trisodium phosphate per gallon of water and scrubbing it with an abrasive sponge. This etches the plastic while it cleans off grime and scuff marks. After the plates have dried and you've taped them down, scuff each plate with 220-grit sandpaper to rough up the plastic even more; then spray a coat of primer from an aerosol can. The primer is a necessity; without it, you'll find that your paint job needs frequent touch-ups.
Painting a Base Coat
You can brush, spray or even roll the paint onto the electrical plates. Spraying from an aerosol can is quick and easy, and it provides a smooth, glossy finish, but applying the paint with the same tools you use to paint the wall provides a texture that more closely matches the wall. You may prefer a texture if your goal is to blend the plates and make them disappear. Because the plates are stuck to newspaper, you can use long, even brush strokes that start beyond one end of a plate and finish beyond the other end. There's no need for starting or ending a stroke in the middle of the plate.
One way to decorate your plates is to lay a stencil over the base coat and spray on a second color. You can repeat this process with different stencils and colors to create layered, multicolored patterns. An alternative is to paint designs with an artist's brush, depicting flowers, stars, gargoyles or anything else you fancy. Whether you use stencils or a paintbrush, allow the base coat to dry first, and coat the plate with one coat of clear varnish to protect the design once it has dried. Save a small amount of paint for the screws, which you can touch up with an artist's brush when you reinstall the plates.