Repairing small cracks in plaster is easy compared to plastering a whole room. To repair small cracks in plaster, you’ll need patching compound, medium- and fine-grit sandpaper, a sanding block, a putty knife, a masonry chisel, a paintbrush, a rag, and a screwdriver. For finishing, you’ll need primer and paint.
Hairline cracks not only look unsightly, but they can eventually lead to larger, more noticeable cracks in the ceiling as well. Hairline cracks are typically ultra-thin, literally as wide as a piece of hair. However, this process can be used even with larger cracks, as long as they are thinner than a dime and aren’t longer than a few feet long. Using selfadhesive fiberglass mesh tape to repair a ceiling crack. Cracks in ceilings are caused mostly by settling of the house and the expansion and contraction created during that settling. To repair a crack in a ceiling: Score the crack with a utility knife to remove any loose plaster or other material that may be inside the crack.
Remember:Plaster repair is much more difficult than fixing drywall. Unless the repair is small, don’t attempt any plasterwork unless you’re trained or experienced. It’s easier to replace a wall or ceiling panel with drywall.
1Use the chisel to widen and undercut the crack.
By making the back of the crack wider than the front surface (undercutting), you create an opening that the plaster can grip.
2Scrape out all loose plaster with the tip of the putty knife, and wipe away the dust with the rag.
You don’t want any loose particles ending up in the plaster patch.
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3Thoroughly dampen the full length of the crack with a wet paintbrush.
Dampen inside the crack, as well. The damp surface will help the plaster adhere well.
4With the putty knife, apply a thin coat of plaster patching compound over the crack.
Be sure to feather the edges. Plaster patching compounds can vary, so follow the manufacturer’s directions for use.
5Let the patch dry completely (usually overnight), and smooth the patch with sandpaper wrapped around a sanding block.
Begin with medium-grit (80-grit) sandpaper to smooth out the bigger bumps. Then, switch to a fine (120-grit) sandpaper to get a fine, smooth finish.
6Paint the patch with primer.
Don’t skip this step or you’ll end up with a permanently goofy-looking, non-matching area.
7Apply touch up paint to the patch in your wall color.
This is why you saved that half a gallon of leftover wall paint.
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Buy a fresh tube of paintable silicone caulking.
Caulking is useless once it becomes dry.
Apply a thin bead of caulk into the crack.
Be sure to get the caulk actually inside the crack.
Smooth out the caulk bead.
You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.
Smooth out the caulk bead.
You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.
Clean away excess caulk.
Wipe the excess caulk away from the outside of the crack. Rubbing alcohol works great.
Paint over the patch with primer.
Don’t skip this step or you’ll end up with a permanently goofy-looking, non-matching area.
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Repairing Hairline Cracks In Ceiling
Apply touch up paint to the patch in your wall color.
Crack In Ceiling Drywall
This is why you saved that half a gallon of leftover wall paint.