Things You\’ll Need
Interior latex paint
Small paint roller
Wooden paint stick (optional)
Latex or water-based sealer (optional)
Choose an interior latex paint for your plaster fireplace
It's easier to paint a fireplace surround before you install it, but if the surround is already in place, you can paint it without removing it. For the best results, choose paint that works well with the rest of the room and is a neutral shade. Since the fireplace is a permanent part of the room and more difficult to change than swapping out furniture and accessories, choosing a neutral shade allows you to get plenty of use from the finished project.
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Prepare for Painting
Remove all items from inside and around the fireplace. Clean up any old ash, and remove it; the ash could get stirred up by the activity in the area and mar your freshly painted surface.
Apply painter's tape to the areas adjacent to the plaster fireplace surround. Covering these surfaces with tape will protect them from paint and help you get a clean finish.
Lay a drop cloth on the floor in front of the fireplace to protect the hearth from paint drips and spills. Part of the drop cloth should be inside the fireplace to catch any drips there, as well.
Use a foam brush to apply primer around the edges of the surround, then fill in the center with a small roller. Work quickly, and clean up any drips right away. Let the primer dry for at least an hour, then apply a second coat. Let the primer dry overnight.
Paint the Fireplace Surround
Shake up the paint or stir it with a wooden paint stick, then pour it into the paint pan.
Apply paint to the edges of the fireplace surround with the foam brush, then fill in the large, flat areas with the mini roller. Let the first coat dry completely.
Examine the fireplace surround for dripped paint or flaws, and use a piece of sandpaper to fix these areas. Add a second coat of paint using the same method you used for the first coat. Let the fireplace dry overnight.
If desired, add a latex or water-based sealer coat to the fireplace surround. This step is optional, but sealer can protect your fireplace and make the surround easier to clean.
Remove the painter's tape and discard it, then remove the dropcloths and trash them.
Allow the fireplace to dry for several days before using it.
Use a grey primer if you are painting the fireplace a dark color and a white primer if you are using a light color. Use a small, fine roller or paint pad for best results.
Don't paint plaster that is freshly poured. Most pre-made surrounds are cured and ready to paint, but if you pour your own plaster surround, wait at least 30 days before painting.