The painters have packed up. In the evening under the tube light the room looks fine. Next morning the sun comes through the window and half the wall is a shade lighter than the other half, with faint vertical bands running down it.
This is the most common complaint after a paint job in Delhi, and unlike bubbling or peeling it is not a damp problem at all. It is a process problem. Something about how the wall was prepared, how many coats went on, how the paint was thinned, or how fast it dried has left an uneven film.
The useful part is that the pattern tells you which one it was. Blotches that follow old repairs mean one thing. Straight vertical bands mean another. A ghost of the previous colour means a third. This page maps the pattern to the cause, then covers how to inspect properly and what to say to the painter.
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In this guide
How to actually look at a wall before you judge it
Do this first, because half of all reported patchiness is either an inspection artefact or paint that has not finished drying. All of it is free.
- 1. Wait for the paint to cure. Emulsion looks patchy while it is still drying, and a fresh wall can take days to even out in colour and sheen. Judging a wall the same evening is judging it too early.
- 2. Look in daylight, not under a bulb. Natural light from a window shows real colour differences. Warm bulb light hides some and invents others. Check the same wall morning and afternoon — Delhi light changes a lot between them.
- 3. Look from an angle, not straight on. Stand at the end of the wall and look along it, almost edge-on. Roller marks, lap lines, missed spots and uneven sheen only appear in raking light. Straight-on under a bulb they are invisible.
- 4. Use a torch along the surface. Hold a phone torch flat against the wall and sweep it along. This is the single best trick for finding roller ridges, patchy putty and thin coverage.
- 5. Check whether the pattern follows something. Does the blotchiness match repaired areas, old crack lines, or where a cupboard used to be? Or is it in even vertical bands the width of a roller? The first is a surface problem, the second is application.
- 6. Check the edges and corners separately. Ceiling lines, skirting, switch plates and door frames are where the least careful work shows.
Checking a paint job before you pay covers the full handover walk-through.
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Get free quotesWhy is my paint not covering? Coats, colour changes and thinning
The commonest cause by far, and it usually shows as broad soft patches where the old surface shows faintly through, rather than as sharp lines.
- Not enough coats. Two full coats over primer is the normal standard. One coat, or a rushed second coat that skipped areas, leaves an uneven film that reads as blotchy in daylight. See how many coats of paint do I need.
- A dark-to-light colour change. Going from a deep colour to white, cream or a pale shade needs more coats than the same paint would need over a similar tone. Two coats of white over a dark red will always look thin and patchy. This has to be agreed before work starts, because it changes both time and material.
- Strong colours that cover poorly by nature. Deep reds, yellows and some strong colours cover less well than mid-tones regardless of quality, and need an extra coat or a tinted undercoat.
- Over-thinned paint. Adding too much water makes paint spread further and go on easier. It also makes the film thinner and more transparent, so coverage drops and streaks show. If the paint looked watery going on and it runs at the skirting, this is likely.
- Is it DIY? Yes in the sense that another proper coat usually fixes it. But if a painter has just finished, this is their coat to apply, not yours to buy.
Whitewash vs distemper vs emulsion is worth reading if you are not sure what was actually applied.
Why is my wall blotchy in patches? The surface underneath
If the blotches have shapes — they follow old repairs, crack lines, or areas that were filled — the problem is under the paint, not in it. An uneven surface absorbs paint unevenly, and the absorbent areas end up duller and lighter than the rest.
- Primer skipped or applied too thin. Primer evens out how much paint the wall drinks. Without it, bare putty, old paint and plaster repairs all absorb differently and every one of them shows through the finish. This is the number one reason for shaped blotches. See wall putty and primer.
- Patch-repaired areas that were not sealed. Filled cracks, plugged holes and putty over a repaired damp patch are far more porous than the wall around them. They show as a map of the repairs. Cracks in walls explains why the same cracks reappear after every repaint.
- New plaster or fresh putty painted too early. New masonry absorbs unevenly while it is still curing, and it also holds alkali which dulls the finish in patches.
- Chalky old paint underneath. If the old surface was powdery and only lightly sanded, the new coat sits on it unevenly. Read chalky or powdery walls to identify that.
- Uneven sanding. Over-sanded high spots and untouched low spots take paint differently, and it shows most in a sheen finish.
- Is it DIY? No. Priming or spot-sealing the whole wall and recoating it is the fix, and painting over the blotches without sealing simply repeats them.
One more thing to rule out: if the patch is dull, cool to touch and keeps returning in the same place, it is not a painting fault at all. Check how to find the cause of a damp wall first.
Roller marks, lap lines and streaks: how it was applied
These are the sharp-edged faults: straight bands, visible roller ridges, and darker lines where two passes met. They come from technique and from Delhi drying speed rather than from the wall.
- Lap marks from paint drying too fast. In a hot dry Delhi room the edge of a wet patch skins over within minutes. When the next roller pass overlaps that skinned edge it lays a second thickness of paint there, and it dries as a visible line. Working on a wall in direct sun or with a fan blowing straight at it makes this much worse.
- Not keeping a wet edge. The cure for lap marks is to paint a whole wall corner to corner in one continuous go, always overlapping into paint that is still wet. Stopping halfway through a wall for a break almost guarantees a line.
- Roller ridges and tramlines. A roller that is overloaded, worn, or pressed too hard leaves raised edges along each pass. These are the ones you find with the torch trick.
- Poor cutting-in at edges. The brushed band along ceilings, corners, skirting and switch plates dries with a different texture from the rolled area. If it is too wide, or if the roller did not go close enough to it, you get a visible frame of slightly different finish around every wall.
- Brush marks in the finish. Usually thick paint, a hot surface, or a coat brushed on where it should have been rolled.
- Is it DIY? A light sand and one properly applied coat in the cooler hours will fix most of it. Doing that on a whole flat is a repaint.
Season matters here too. The best time to paint and waterproof in Delhi explains why peak summer afternoons and monsoon humidity both work against a smooth finish.
What to raise with the painter, and when
Raise it before final payment and while their materials are still on site. Almost every fault on this page is corrected with proper preparation and one more coat, which is a small job then and a full repaint later.
- Do the daylight walk-through with them present. Go wall by wall, look along each one at an angle, and point at specific spots rather than saying the room looks patchy. Specific is fixable.
- Ask how many coats went on that wall, and whether primer was applied to the full wall or only to patched areas. Those two answers explain most blotchiness.
- Ask whether the paint was thinned, and by how much. A reasonable painter will tell you straight.
- Agree the fix as whole walls, corner to corner. Touching up the middle of a wall always shows, because the surrounding paint has already started to weather. This is the single most common argument after a repair.
- Agree the timing. Recoats should go on when the wall is not in direct sun and the previous coat is properly dry. Insisting it be finished the same evening is how lap marks happen twice.
Agree the scope before work starts to avoid the argument entirely: number of coats, whether primer covers full walls, and how a dark-to-light colour change will be handled. What drives the figure on a quote is covered in house painting in Delhi NCR and painting labour per square foot. Your side of the preparation is in preparing your home before painters arrive, and wall and paint care tips covers keeping the finish once it is right.
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Get free quotes →Frequently asked questions
Why is my paint patchy after painting?
Why is my paint streaky with roller marks?
Why is my white paint not covering the old dark colour?
How do I check a paint job properly?
Will a patchy wall even out on its own after drying?
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How we put this guide together
This guide is compiled from common Delhi NCR service patterns and reviewed by the XpertWorker team. XpertWorker connects you with independent, local professionals — we never charge you a paisa, and each professional sets their own price and quotes you free.