Perfection may not be possible when repairing a skim coat, but you can make the repaired area less noticeable by using ahandheld block sander with fine-grit sandpaperto smooth the plaster patch. Blend the old skim coating and the new as much as possible. Once the skim coat is dry, you can paint the plaster if desired.
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What is skim-coating a plaster wall?
Learn everything you need to know about skim-coating a plaster wall. Photo: Flickr. Traditional plastering consists of three separate coats of plaster. The first two, called the brown and scratch coats, are coarse, often with sand, horsehair, and other binders added to the mix.
How do you finish a plaster top coat?
Once the coat has cured, follow the same procedure as you would for a plaster topcoat: check the walls closely for voids and high spots, circle them with a pencil, and use a taping knife to quickly make repairs. As always, sand the finish coat smooth and touch up as needed. Last step: sanding for a smooth finish coat.
What is skim coat?
The skim-coat approach, which involves the application of a single, eighth-inch-thick layer of plaster over the entire wall or ceiling surface, is a compromise, offering something of the charac …
How do you fix plaster that won鈥檛 dry?
As the plaster begins to dry, brush a coat of water over it and smooth it out quickly. This will help the plaster cure to a smooth finish. If portions of the plaster have detached from the underlying lath, all of the unsound plaster will need to be removed.