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Checking wall plaster quality before painting

How to Check Plaster Quality: 7 Tests Before You Paint

Subhang Reddy2 min read

Paint shows every flaw in the plaster beneath it. Checking before the painters arrive is far cheaper than repainting.

The Seven Checks

CheckHowWhat's acceptable
Flatness2 m straight edge in several directionsSmall, even gaps only
BondTap with a coin or knuckleSolid sound throughout
CracksLook with side lightOnly fine, stable shrinkage cracks
Corners and edgesStraight edge and squareStraight, sharp, square
OpeningsAround doors and windowsEven margins, plumb reveals
FinishRun a hand over itEven texture, no loose sand
CuringAsk, and look for dustingCured at least 7 days

Fixing What You Find

ProblemFix
Hollow patchesCut out, clean, dampen, replaster
Junction cracksOpen up, fix mesh, replaster
Fine shrinkage cracksFill before putty
WavinessLevel coat or putty, if minor
Dusty surfaceIndicates poor curing; consult before painting

The Short Version

Straight edge, tap test, side light, square corners — then fix hollows and junction cracks before any paint goes on.

Frequently Asked Questions

How do I check if plaster is good?

Check flatness with a straight edge, tap for hollow sounds, look for cracks especially at junctions, confirm corners are straight and square, and check that it was cured.

What does hollow-sounding plaster mean?

The plaster has lost bond with the wall behind it. Hollow patches can crack and fall later and should be cut out and redone.

Are hairline cracks in plaster a problem?

Fine shrinkage cracks are common and can be filled before painting. Cracks along wall–column junctions mean mesh was missing; wide or growing cracks need investigation.

How flat should plaster be?

A common check is a 2 m straight edge with only small gaps beneath it; noticeable waves show under paint, especially with side light.

When should plaster be painted?

After it has been cured and has dried out properly, which usually takes several weeks; painting too early traps moisture.

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