Plastic anchors, molly bolts, and toggle wings do not fail the same way once whatever they were holding comes down. Some spin loose with a screwdriver, some have to be driven through into the wall cavity, and some tear a fist-sized crater out of the drywall face on the way out. Pull the anchor first and match the fix to what’s left of the hole, not to how big the hole looks right now.
What is actually going on
Every anchor grips the wall in one of two ways: by friction or threads against the front face of the hole, or by flaring out wider than the hole once it’s through, gripping the back face instead. That difference is what decides whether it backs out the way it went in, or has to be pushed through and left inside the cavity for good.
How each anchor lets go
A plastic expansion anchor, the kind that flares out as the screw bites in, usually backs out with a screwdriver or a pair of pliers gripping the collar. Some are soft enough to be pushed straight through into a hollow wall instead, which leaves a clean round hole and nothing left to dig for. A self-drilling anchor, the type with sharp threads that bite directly into drywall without a pilot hole, comes out the same way it went in: turn it counterclockwise and it unscrews whole.
A molly bolt is a different animal. Its metal sleeve expands behind the wallboard when the screw is tightened, gripping the back face of the drywall like a rivet. The screw has to be backed almost all the way out before the sleeve will collapse, and if it’s yanked or pried before that happens, the flared metal tears a ragged lip out of the paper facing on its way through. A toggle bolt goes further still: its spring-loaded wings open up inside the wall cavity and are never coming back out. Once the screw is removed, the wings simply drop and stay there, harmless, rattling loose behind the board.
In masonry, a plastic sleeve anchor set into brick or block behaves differently again. It grips by friction against a drilled hole rather than by flaring against the back of a board, so it comes out by unscrewing, or by drilling it out entirely if the thread has stripped inside the sleeve. The usual approach is to match anchor type to wall type before ever drilling, but once something has already come down, the job in front of you is extraction, not selection.
Why the hole size lies to you
A hole that looks tiny from the front can have a much wider zone of loosened paper and crumbled gypsum around it if the anchor was carrying more weight than it should have and had already started to pull free before whatever was hanging there actually came down. That’s the case where a patch that only fills the visible gap fails again within days, because the board around it is no longer solid. The wall material and what the anchor was ever rated to hold decide the whole approach, a decision covered in full on Hanging, Shelving and Fixing: The Wall Decides.
Doing it
Getting the anchor out clean matters more than the patch itself. Filler bonds to bare drywall paper and gypsum, not to a plastic collar or a bent metal sleeve sitting proud of the surface, so anything left behind telegraphs through paint as a hard lump no amount of sanding will hide.
Removing what’s left
| Anchor type | How it comes out | What’s left in the wall |
|---|---|---|
| Plastic expansion anchor | Unscrews with a screwdriver, or pushes through into a hollow wall | Small round hole, occasionally a hairline crack at the edge |
| Self-drilling anchor | Unscrews directly, no pilot hole to deal with | Clean hole the width of the anchor’s collar |
| Molly bolt | Screw backed out fully so the sleeve collapses, then pulled or tapped through | Torn paper facing if the sleeve wasn’t collapsed first |
| Toggle bolt | Screw backs out; the wings drop inside the cavity and stay there | Only the bolt’s own hole needs filling, the wings are never recovered |
None of this needs to happen fast. Backing an anchor out a quarter turn at a time when it’s stiff does less damage than forcing it and tearing the board around it, which only makes the eventual patch bigger than the original hole ever was.
Filling so it doesn’t show
- Remove the anchor completely before touching any filler. Spackling over a protruding collar or a bent sleeve leaves a bump that shows through even a thick coat of paint.
- Brush or vacuum loose debris and dust out of the hole. Filler pressed onto dust doesn’t bond to the board underneath, and the patch pops out within weeks, not months.
- For a small, clean hole, press lightweight spackle or joint compound in with a putty knife, slightly proud of the surface. Skipping the overfill means the patch shrinks below flush as it dries and needs a second coat regardless.
- For a larger hole, or one with torn paper facing from a molly bolt sleeve, lay a piece of self-adhesive mesh tape or a stiff scrap of card across the gap before filling. Without it the compound has nothing to grip and sinks into the cavity instead of bridging the hole.
- Let each coat dry fully before sanding. A cavity wall can look dry on the surface while the compound underneath is still soft, and sanding too soon tears a crater right back out of a patch that seemed finished.
- Sand lightly, feathering the edge out wider than the patch itself, then rake a light across the surface at an angle. A shallow dip that’s invisible standing square to the wall shows up the moment paint catches it.
- Prime the patch before the topcoat goes on. The usual practice is to seal bare filler first, because raw compound and painted drywall absorb paint at different rates and flash as a slightly different sheen if it’s skipped.
What it looks like when it goes wrong
Most repair failures on this job show up the same way: a patch that looked flat and level while wet, then reads as a shadow or a slight dome once paint goes over it. That’s a cosmetic problem, not a structural one, and it’s fixable without opening the wall back up.
Cosmetic failures
- Ghosting: the patch is a different sheen from the surrounding paint even though it sits flush. Fixable by priming the spot and repainting the whole panel, since a spot repaint of a small square is usually what causes the mismatch in the first place.
- Proud patch: a hard ridge you can feel with a fingernail. Fixable with more sanding, feathered further out than it looks like it needs.
- Sunken patch: a shallow dish that only shows under raking light. Fixable with a thin skim coat over the low spot, sanded flush once dry.
- Cracked patch: a hairline split reappearing along the old hole’s edge, usually because no mesh or tape went over torn paper facing. This one needs redoing rather than papering over: dig the crack out, tape it wider than last time, and refill.
A patch that keeps cracking along the same line even after redoing it usually means the tape or mesh didn’t reach solid board on both sides, not that the filler itself was wrong. Widen the tape past the damaged paper on the next attempt rather than adding another coat of compound over the same crack.
The one that isn’t cosmetic
A screw or anchor fragment painted over and left inside the wall carries a different kind of risk. The next person drilling into that same patch has no way of knowing metal is buried there, and a drill bit hitting it can skate off at speed or snap, a hand and eye injury risk rather than a decorating one. Any anchor fragment that can’t be fully removed should be noted or marked, not simply painted over as if the hole were empty.
What to settle first
Before any of this, work out what the wall actually is. Drywall, plaster over lath, and masonry all take an anchor differently, and the removal method that works cleanly on one can crack the face of another.
What’s behind the surface
A stud finder or a small test hole in an inconspicuous spot tells you whether there’s a wooden or metal frame member right behind the anchor, or just open cavity. That matters for the anchor itself, and it matters for what else might be routed through that same stretch of wall, since wiring, plumbing and ductwork all run inside stud bays and don’t announce themselves until a drill bit finds them. The places in a wall you must not drill covers where those runs are most likely to sit, and it’s worth checking before assuming the space behind a patched hole is empty.
Whether the wall was right for the job
If the anchor pulled free because the wall couldn’t hold the weight, patching the hole and reusing the same anchor in the same spot just repeats the failure. That’s usually a sign the load needed a stud, a different anchor rated for the wall type, or a mounting point somewhere else entirely, and it’s the decision to make before the patch goes in, not after. Anyone repairing this kind of damage in a rented property has an added constraint on top of the wall itself, since some fixing methods leave marks a landlord can charge for and others don’t: hanging things when you are renting covers which is which. Settle what the wall can actually carry before deciding how to patch it, otherwise the repair is only cosmetic and the same hole reopens the next time something goes up in that spot.
It also helps to settle, before the patch goes in, how visible the repair needs to be. A wall behind a door, or one that’s getting a shelf put straight back up over it, tolerates a rougher patch than a wall at eye level in a hallway. The usual convention is to spend more time feathering and priming on the surfaces people actually look at closely, rather than treating every hole the same regardless of where it sits.
Common questions
Do I need to remove a toggle bolt’s wings before patching?
No. Once the screw is out, the wings drop inside the wall cavity and stay there. They’re not recoverable without cutting into the wall, and leaving them isn’t a problem since they simply lie flat behind the board.
Can I just paint over a small anchor hole without filling it first?
Not if you want it to disappear. Paint bridges hairline cracks but not a hole with any depth to it, and a hole left unfilled telegraphs through even several coats as a slight shadow or a dent you can feel with a fingertip.
What if the anchor spins in place and won’t back out?
Grip it with pliers close to the wall face and turn, since a spinning anchor usually means the plastic has stripped against the drywall rather than against the screw. If it still won’t move, pushing it through into a hollow wall is usually easier than fighting it from the front.
How long should I wait between filler coats?
Long enough for the coat to feel firm and cool rather than tacky, since a cavity wall traps moisture behind the surface and a patch that looks dry on top can still be soft underneath. Rushing the second coat is the most common reason a finished-looking patch sinks a day later.