Wall preparation
Putty, POP and plaster are three different things.
Ask three people on a site and you'll get three different answers about which one your wall needs. They're used for different jobs, and mixing them up is behind a lot of disappointing finishes.
Reviewed 21 September 2026 by PremiumWalls operations.
At a glance
What is the difference between wall putty, POP and plaster?
Plaster is the thick base layer over brick or block that gives a wall its shape and level. Putty is a thin skim coat over that base to give a smooth surface for paint. POP (plaster of Paris) is a fast-setting gypsum material used for smooth finishes, repairs and ceiling work. They aren't interchangeable, and which one you need depends on the wall's condition.
Putty vs POP vs Plaster: What Each Is For
Plaster is the body of the wall surface
On most Indian buildings, plaster is a cement-sand mix laid over brick or block. It evens out the masonry and forms the surface everything else sits on. If a wall is out of level, hollow-sounding or has broken away, the fix belongs at the plaster stage, and no amount of skim coating will do that job.
Putty is the thin smoothing layer
Wall putty is applied in thin coats over sound plaster to close up fine pores and small marks and give a flat, even face for primer and paint. It isn't there to build up thickness or hide real unevenness. Put on thick to cover a bad surface, it tends to crack and come away.
POP is a different material with different uses
Plaster of Paris is a gypsum product that sets quickly. It's popular for smooth interior finishes, for filling and levelling small repairs, and for ceiling and decorative work. It doesn't like damp, so it's a poor choice on walls with any moisture problem, and it needs a proper base under it.
Which suits which situation
The question to ask is what's actually wrong with the surface. Levelling, smoothing and repairing hollow areas are three separate jobs, and each has its own material.
- Wall out of level, or hollow in places: plaster repair or levelling comes first
- Sound wall with fine pores and small marks: putty
- Small holes, chips and patch repairs: filler or POP, depending on the spot
- Damp or seepage-prone wall: treat the moisture before any of these
Why people confuse them
All three are white or greyish powders that go on wet and get sanded smooth, so they look alike on a site. Some contractors also use the words loosely, or offer one because it's quicker or cheaper to apply. A wall that's been skimmed with the wrong thing can look fine when it's handed over and show cracks or lifting later.
How to decide for your walls
The honest answer comes from looking at the walls. Tapping for hollow spots, checking level with a straight edge, and looking for damp are what settle it. That's why we specify the preparation after an inspection, and the itemised quotation shows which surface gets which treatment.
Putty vs POP vs Plaster: What Each Is For — your questions.
Can putty be used to level an uneven wall?
Only for very slight variations. Putty is a thin coat, and building it up to cover real unevenness usually leads to cracking. Proper levelling is done at the plaster stage.
Is POP better than putty?
They aren't ranked, they're different. POP suits certain smooth finishes and repairs but doesn't tolerate damp well. Putty is the usual smoothing coat under paint on sound walls.
Do I need to remove old putty before repainting?
If it's sound and well bonded, often not. If it's flaking, powdery or coming away in sheets, it needs to come off first, because new coats will only be as firm as the layer beneath.
Why does my wall have cracks soon after putty was applied?
Usually because the base plaster had its own movement, was uncured, or the putty went on too thick. Cracks that show up early often point at the layer underneath.
Let us look at your walls first.
Tell us about the property and we will set up a free colour and wall inspection. You get a written, itemised quotation afterwards, with no obligation to go ahead.
- We call you back the same day to get a picture of the property and the surfaces.
- We agree a time and come out for the free inspection.
- You get the written scope and itemised quotation.
- Nothing starts until you approve it.