- 1). Put on your safety gear. Plaster is a very dusty substance, and you don't want it to get into your respiratory system. Use a mask or a respirator rated for drywall and plaster work. Put on safety glasses and rubber gloves as well. Long sleeves are also recommended.
- 2). Break away any loose plaster. The area around the plaster crack or hole will need to be cleared away and smoothed out before you can apply the patch. Knock away any large pieces with a hammer and use your hand to remove any debris that may be left behind.
- 3). Mix a small amount of plaster of Paris in a bucket. Unless there is a very large area to cover, you won't need a lot of plaster. Since this material sets so quickly, it's better to make too little than to have an entire bucket of plaster that's gone hard. Mix the plaster with water according to the manufacturer's instructions.
- 4). Begin patching the cove. Use a hawk to make this job easier -- it's a small square of metal with a peg on the back to hold. Use your trowel to transfer the plaster from the hawk. Place a small glob on the trowel and begin smoothing it onto the cove. Always work from the bottom up when you are plastering. Keep an even hold on the trowel to apply a level coat, but finish the upstroke in a random arching pattern to help the plaster blend better.
- 5). Allow the plaster to set for 30 minutes, and then sand down any uneven edges or ridges with a fine-grit sandpaper. The entire surface should be smooth to the touch.
- 6). Paint over the patched area. Use a latex paint that is rated for use on plaster and apply one thin coat. Let this dry, and apply a second coat if necessary.
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