A plastered wall could be virtually indistinguishable from one covered with drywall till cracks appear. In drywall, cracks tend to follow along with the joints between drywall sheets, but within plaster, they can run in any path, and they tend to appear more often. They occur because plaster is brittle and can't withstand movements within the framing caused by moisture and settling. You are able to repair these cracks using either plaster or even drywall joint compound, but they will keep coming back if you do not tape them first. Self-adhesive fiberglass mesh is the greatest tape for the job.
1. Rake within the damaged plaster with a paint scraper. Avoid using the tool to scrape simply draw it within the damage to remove loose material, which should fall out by itself.
2. Unroll enough self-adhesive fiberglass mesh tape to pay for the crack. If the crack curves, cut another piece for each leg of the curve don't attempt to follow a curve by bunching up just one piece of tape and cut the tape as needed with scissors and place it to the wall, overlapping pieces as required to cover the crack.
3. Cover the mp3 with plaster or drywall joint compound. Check the container if you are using plaster to determine whether or not you need to wet the wall before applying it. When the instructions specify that you do need in order to moisten the wall, do it with the sponge soaked in water.
4. Apply one coat of plaster or drywall joint compound within the tape. If you use joint compound, spread it having a 6-inch drywall knife and scrape the area lightly to flatten it. If you make use of plaster, apply it with a plastering trowel and laying it overt the tape and feathering the edges into the surrounding wall in addition to possible.
5. Apply another coat of joint compound following the first one dries, using an 8-inch chef's knife. Smooth it on and scrape off the surplus, feathering the edges into the wall. If you are using plaster, apply a thin layer within the previous one after it has dried in order to fill holes and voids.
6. Apply a couple of more coats of joint compound, using the 10- or 12-inch knife. Scrape the edges of every coat carefully to feather them into the wall and make the repair invisible. If you are doing the repair with plaster, you shouldn't need to apply any more after the second layer has dried.
7. Sand the repair lightly having a sanding sponge once the plaster or combined compound has set. .
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