Wall cracks keep coming back after painting — how do I stop them for good?
Every time I repaint, the same hairline cracks come back within months — usually near door corners and along ceiling joints. Filling and painting clearly isn't enough. How do I actually stop them coming back?
4 answers
Cracks that keep returning in the same spots are movement cracks, not paint failure — so filling the surface and painting over never lasts. What's happening:
- Door/window corners crack because stress concentrates there.
- Ceiling and wall joints (especially gypsum board) move with temperature and settlement.
To fix properly: 1. Rake the crack open slightly rather than skimming over it — you need filler *in* it, not on it. 2. Use a flexible/elastomeric filler, not just gypsum powder, so it moves with the wall. 3. On gypsum-board joints, embed jointing tape or fibreglass mesh over the joint before skimming — that bridges the movement. 4. Prime the repair, then paint.
If a crack is wide, growing, or runs diagonally across a wall, that can indicate structural movement — get it looked at rather than just filled.
The mesh tape on gypsum joints was the missing step for me. Filler alone kept cracking; tape plus flexible filler finally held.
For anyone doing this as part of getting a place ready to rent or sell: fixing recurring cracks PROPERLY (rake them out, flexible filler, tape on gypsum joints, then repaint) is exactly the make-good that pays off, because a fresh neutral repaint over sound walls is the highest-return refresh there is. There's a thread on which refresh jobs actually pay off before renting or selling. Patch the cracks right first, or they telegraph back through the new paint and undo the fresh look you paid for.
Worth flagging a related-but-different recurring wall problem for anyone here: if what keeps coming back isn't a crack but a white, powdery patch, that's efflorescence — soluble salts brought to the surface by moisture — and it needs a completely different fix (trace and fix the water source, dry-brush, then repaint), not filler. There's a thread on white powdery bloom on painted walls and how to actually stop it. Cracks that keep returning are usually movement/prep; a returning white bloom is moisture. Two different recurring marks, two different fixes — worth knowing which you've got before you repaint.
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