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You can paint over plaster, but repair any damage to the plaster first, or the paint will crack and bubble. You should also prepare the surface of the plaster to accept paint, which gives your paint job the best chance of looking good and lasting a long time. Before applying the color you want, apply a coat or two of primer. Additionally, use latex paint, and choose a latex paint with a satin finish for areas with dampness, like bathrooms.

Painting a wall involves multiple steps. First, clean and sand the wall to prepare the surface, then tape off any areas where you don't want paint to go. Next, shake or stir the paint in the can, then pour it into a tray. 

Dip a paintbrush into the paint can so that half of the bristles are coated. Use the brush to cut in or make a frame around the edges of the wall. Then, roll the paint roller in the tray, ensuring that it is evenly covered in paint. Roll the paint onto the wall in an "M" or "W" formation, making sure the paint is applied evenly.

In some cases, you may be able to skip the primer and paint over old paint. If you’re painting over paint that’s in good condition and is a similar color and finish to the new paint, you probably don’t need to use primer. If the old paint is dark or uneven or the wall has stains or damage, you’ll want to apply primer before a new coat of paint.

Painted vinyl siding can last 10 years or longer. To ensure long-lasting results, be sure to use vinyl-friendly paint as well as proper preparation and application techniques. Note that if you live in a harsher climate with frequent storms or excessive heat, for example, your vinyl siding paint job may not last as long.