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Two different jobs
Patching fills isolated damage. A full skim re-surfaces the whole wall so there is no boundary between old and new. They cost very different amounts and they solve different problems, and conflating them is how people end up paying twice.
When patching is enough
A handful of small holes, no more than a few per wall, on a surface that is otherwise flat and sound. Feathered properly and spot-primed, those disappear. The test is simple: stand at the far end of the room with light raking across the wall. If the wall reads flat, patch it.
When you need a full skim
- Visible patch outlines from a previous repair — they will come back through new paint.
- Walls that are wavy or out of true, where a change of sheen shows every ripple.
- After hacking, conduit chasing or removals, where damage runs in lines rather than spots.
- Any dark-to-light colour change, which is unforgiving of surface variation.
Drying time is part of the job
Skim needs to dry before it takes paint, and in Singapore's humidity that is rarely overnight. Two to five days is typical depending on thickness and ventilation. Painting over damp skim is what causes the flaking that shows up six months later.
If you can see where the last repair was, patching again will show too. That is the whole test.
Our usual advice
If more than a quarter of a wall needs work, skim the wall. If more than half the walls in a room need work, skim the room — the boundary between skimmed and unskimmed walls is itself visible under side light.
- #plaster
- #skim coat
- #painting
This article is general information. Every property is different, so have the work assessed by a qualified professional before it starts.
