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How to patch drywall
A doorknob hole, a nail pop, or the dent left by moving furniture all patch the same way. The wall is gypsum board covered in paper, so the fix is about backing, filling in thin layers, and sanding less than you think. Rush the layers and the patch telegraphs through the paint for years. Work thin, let each coat dry, and the repair disappears.
Size decides the method. Holes under about 2 inches take filler alone. Holes from 2 to 6 inches need a self-adhesive mesh patch or a California patch. Anything larger, or damage with soft and wet board around it, gets a cut-out repair with a wood backer, described in step 2.
Tools required
- Utility knife with a fresh blade
- 6-inch taping knife
- 120-grit sanding sponge
- Drill or driver (only for the backer method)
- Tape measure and pencil
- Work light you can hold low against the wall
Materials required
- Self-adhesive mesh patch, 4-inch or 6-inch, 1 pack (medium holes)
- All-purpose joint compound, 1 quart (enough for about 6 medium patches)
- Scrap drywall piece, about 12 by 12 inches (large holes only)
- Scrap wood, about 1 by 3, cut 4 inches longer than the hole (large holes only)
- Drywall screws, 1 and 1/4 inch, small box
- Painter tape and a drop cloth
- Primer and matching wall paint, 1 quart each
Step by step
Clean and square the damage
Cut loose paper and crumbled gypsum away with the utility knife until the edge is firm. Wipe dust off with a dry cloth. Filler bonds to solid board, not to dust, so this minute decides how long the patch lasts.
Add backing if the hole is large
For holes over 6 inches, cut the opening into a clean rectangle. Slip the scrap wood inside the wall, hold it centered, and drive two screws through the drywall into the wood above and below the hole. The backer gives the new piece something solid to screw to.
Set the patch
Medium holes: press the mesh patch flat over the hole, centered, with no lifted corners. Large holes: cut the scrap drywall to fit the rectangle, screw it to the backer, and tape the seams with mesh tape. Small holes and nail pops: skip the patch and go straight to filler. For a nail pop, drive a new screw an inch above the popped nail first.
First coat, thin and wide
Load the taping knife and press compound through the mesh, then scrape hard so the coat is barely thicker than the tape. Feather the edge about 2 inches past the patch on every side. A thick first coat shrinks, cracks and sands into a visible mound.
Second coat, wider than the first
Let the first coat dry fully, usually 24 hours for ready-mix compound. Sand lightly, wipe the dust, then apply a second coat feathered 4 inches past the patch. Hold the work light low against the wall as you go. Raking light shows ridges your eyes miss from the front.
Sand, check, spot coat
Sand with the sponge in wide circles until your palm, run flat across the patch, feels no edge. If it catches, add one thin spot coat on that edge only, dry, and sand again. Most patches need two coats. Deep fills need three.
Prime before you paint
Joint compound drinks paint differently than wall board, so an unprimed patch shows as a dull spot called flashing. Roll primer over the patch and a few inches around it, let it dry, then paint the full wall section corner to corner for an invisible blend.
Finishing and upkeep
Keep leftover paint labeled with the room and date. The next dent, and there will be one, becomes a ten-minute touch-up instead of a color-matching trip. Store compound sealed and indoors. Frozen compound turns grainy and should be replaced.
When to call a pro instead
Call a pro when the board feels soft or smells musty, which points to water damage behind the wall, when cracks keep reopening along the same line, or when the damaged area is bigger than about 2 by 2 feet. Those are diagnosis jobs first and patching jobs second.
Questions homeowners ask
Can I use spackle instead of joint compound?
For nail holes and dents under half an inch, yes. Spackle shrinks less and dries faster. For anything with mesh tape or a patch, joint compound is the right material.
Why does my patch show through the paint?
Almost always one of two causes: the patch was not primed, or the feather edge was too narrow and the ridge catches light. Sand wider and prime.
How much would a pro charge for this?
A handyperson typically charges $150 to $350 for a medium patch including paint matching, which is why this is one of the best-value beginner projects to learn.