Wall repairs
Holes, impact damage and cracked walls made good first, because a skim follows the surface rather than fixing it.
Wall repairsResurfacing
Skim coating and resurfacing: a sound surface brought back to one plane
A thin coat taken over the whole wall or ceiling rather than the damaged part of it, so years of separate repairs, old texture and tired surfaces stop reading through the paint.
There is a point where filling one more patch stops helping. The board is fine, the frame is fine, nothing is broken. The surface is simply no longer one plane, because it carries a decade of repairs done at slightly different levels, or a texture somebody rolled on in the 1980s, or the shadow of wallpaper that came off in pieces.
A skim is the answer to that specific problem. The whole surface gets a thin coat, worked out to the edges, so the wall or ceiling is flat again as one piece instead of flat in patches. It is finishing work, not repair work, and the difference matters when you are deciding what to ask for.
- Whole walls and ceilings, not patches
- Over texture, old repairs or stripped paper
- Finish level agreed before we start
The surface gets tested first
Whatever is already on the wall decides whether a skim will hold. That is checked, not assumed.
Flat as one piece
Worked wall by wall and ceiling by ceiling, so there is no line where the good work stopped.
The finish level is agreed
How flat you actually need it changes the coats and the price, so it is settled up front.
Damage is repaired, not buried
Anything broken is fixed properly before the skim. A thin coat over a hole is still a hole.
Start here
When a skim is the right call
Skimming is not a general purpose fix. It solves one problem very well: a surface that is sound but no longer flat. These are the situations where it is usually the right answer.
- A wall or ceiling carrying so many separate repairs that the patches now shadow under the light
- Old rolled, stippled or trowelled texture you want gone without re-sheeting the room
- Walls left scarred and patchy after wallpaper and its adhesive came off
- An existing hardwall or rendered wall that is sound but wavy and tired
- Board that was set to a basic standard and now has to carry gloss paint, dark colour or grazing light
- A room where new sheeting meets old surfaces and the two planes do not agree
- A ceiling being brought back to flat after downlights, a fan or a duct were relocated
- A fit-out or rental turnover where the surface has to look new but nothing is structurally wrong
- Walls that read fine by day and show every imperfection once a wall light or a floor lamp is on
- A sound surface that simply has to be better than it is before a painter starts
Finish levels
How flat do you actually need it
Flat is not one standard, and the difference between the usual finish and the highest one is entirely about how the surface behaves under light. Agreeing this before we start is what stops the argument at the end.
| Finish | What the surface gets | Where it suits | What shows if you go lower |
|---|---|---|---|
| A standard set finish | Joints, angles and fixings set and sanded, the surface flat but not coated overall | Most walls and ceilings in normal domestic light, painted in a flat or low sheen colour | Nothing much, as long as the surface was reasonably flat to start with |
| A skim over the whole surface | A thin coat taken across the full plane, then sanded so the surface reads as one piece | Patched, textured or tired surfaces where the differences between areas are the problem | The patch pattern coming back through the paint, strongest under raking light |
| A skim to a high flatness standard | A further coat and a longer sanding and checking process across the whole surface | Gloss and semi-gloss paint, dark or saturated colours, and surfaces lit close along their face | Every slight variation in the plane, made obvious by the sheen of the paint or the angle of the light |
| A matched texture instead | The existing texture reproduced over the repaired area rather than removed | Older ceilings where removing the texture entirely is not wanted or not worth the cost | The patch reading as a different texture, which is usually more obvious than a difference in flatness |
Scope
What a skim covers, and what has to happen first
This page owns resurfacing: taking a surface that is structurally sound and making it flat again. Fixing what is broken, and applying solid plaster to masonry, are separate jobs with their own pages and their own methods.
What this covers
- A full skim over walls, ceilings or both, taken out to the edges of the plane
- Skimming over old texture where the coating has been checked and is sound enough to hold a coat
- Resurfacing after wallpaper removal, once the residual adhesive has been dealt with
- Skimming over existing hardwall, render or older set finishes that are sound but uneven
- A bonding or sealing coat where the surface needs one before compound will stick to it
- Bringing new work and old surfaces into one plane where a room has been extended or altered
- A higher flatness finish where the paint or the lighting demands it, agreed as its own item
- Sanding, dust clean-up and a paint-ready hand-over
What this is not
- Holes, impact damage and cracked walls, which is wall plastering and repairs and happens before any skim
- Cracked, patched or damaged ceilings, which is ceiling repairs
- A ceiling that has dropped or taken on water, which is sagging or water damage work
- Traditional plaster applied in thickness over brick or block, which is internal solid plastering
- Polished and decorative finishes, which are venetian plaster and microcement
- Sprayed vermiculite and popcorn coatings, which must be assessed before anything is sanded or scraped and sit on the textured ceiling page
A skim is a finishing coat, not a structural one. It will not hold a loose surface down, close a live crack or make a soft area firm. Where any of those turn up, they get fixed first and then the skim goes over the lot.
Suitability
Surfaces a skim will hold, and surfaces to sort out first
Almost everything about whether a skim lasts is decided by what is under it. This is roughly how we sort a surface when we look at it.
Fine to skim, with normal preparation
- Painted plasterboard in sound condition, however many times it has been patched
- Old texture that is firmly bonded and does not powder when you rub it
- Sound hardwall or rendered walls that are simply out of shape
- Walls left rough after wallpaper, once the adhesive has been washed back
- Surfaces where the sheen has been taken off or a bonding coat can be applied
- New board that has been set and now has to meet a higher standard than it was finished to
Fix or answer this before any skim
- Paint that is flaking, blistering or lifting away from the surface underneath it
- A surface that chalks or powders onto your hand, which nothing will bond to until it is sealed
- Active cracking, or a crack that has already reopened once after being repaired
- Anything soft, springy or bulging, which is a fixing or a water problem and not a flatness problem
- A stain with a defined edge, or any sign the surface has been wet recently
- Sprayed or heavily textured ceiling coatings of unknown age, which need assessing before disturbance
- A wall so far out of plumb that a skim would not correct it, where lining over the top is the real answer
Under the coat
What the substrate changes about the job
A skim is the same idea on every surface and a different job on each of them. What is already there decides the preparation, the number of coats and how long the room is out of use.
- Painted plasterboard. The straightforward case. The surface is cleaned, the sheen knocked back or a bonding coat applied, then the skim goes over the whole plane.
- Old texture. Tested first. Heavy peaks are knocked off so the coat is not chasing them, then bonded and skimmed. Deep texture takes more coats than people expect, which is where the price moves.
- After wallpaper. Adhesive residue is the issue, not the paper. Any that is left will soften under fresh compound, so it gets washed back and sealed before anything else happens.
- Hardwall and render. Usually sound and usually wavy. It takes a coat well, but the surface is often thirsty, so it gets sealed or bonded or it will pull the moisture straight out of the compound.
- Freshly patched surfaces. Repairs have to be complete, dry and fully set first. Skimming over a repair that is still shrinking simply moves the problem up one layer.
How the job runs
Test, prepare, bond, coat, sand, check under light
The coating itself is quick. Everything either side of it is what makes the difference, and the drying between coats is what sets the timeline.
- 01
Test what is there
Before anything is quoted we check how the surface behaves: whether it is firm, whether it powders, whether the paint is sound, and whether anything is loose. On texture that includes working out how deep it is, because depth decides the coats.
- 02
Repair anything broken
Holes, cracked sections, loose joins and lifted tape are dealt with as repairs first and allowed to dry. A skim is a millimetre or so of material and it will follow whatever is underneath it rather than correct it.
- 03
Protect and prepare
Floors and anything staying in the room are covered, fittings and plates come off where they should, and the surface is cleaned and either de-glossed or bonded so the compound has something to grip.
- 04
First coat, worked out to the edges
The coat is taken across the entire plane rather than the problem area, and carried into the corners and up to the junctions, so there is no line where the skim stops and the original surface begins.
- 05
Further coats as the finish needs
Each coat dries before the next one goes on. A light refresh may need one pass. Deep texture, a wavy render or a high flatness finish needs more, and that is the honest reason a skim takes days rather than hours.
- 06
Sand, then check it under raking light
Sanded back and checked with a light held flat against the surface, which shows the plane far better than looking straight at it. Dust is cleaned up and the room is handed over ready for a painter.
Test and prepare Coat and finish
The quote
What a skim is priced on
Skimming is quoted on area, then adjusted by the things that change how many coats it takes and how much preparation comes first.
Area and how many surfaces
Walls only, ceilings only, or both. Ceilings are slower than walls of the same area because of the working position and the amount of material overhead.
What is already on the surface
Flat painted board is the base case. Deep texture, old render and adhesive residue all add preparation and usually add a coat.
How much repair comes first
The skim price assumes a sound surface. Holes, cracked sections and loose areas are repair work, priced separately, and they have to be done and dried before the skim starts.
The finish level agreed
The difference between a good flat surface and one that has to hold up under gloss paint or a raking wall light is a further coat and a much longer sanding and checking process.
Coats and drying time
Every coat needs drying time before the next one. More coats means more days in the room, and that is usually the biggest single thing people underestimate.
Room height, access and shape
A stair void, a raked ceiling, a high entry or a room full of returns and reveals all slow a coat that wants to be worked continuously.
Fittings, furniture and occupancy
An empty room is quick to protect. A furnished home, a tenanted unit or a shop that has to keep trading changes how the work is staged and how much time goes on covering up.
Dust management
Sanding a whole plane makes far more dust than sanding a patch. Where the room has to be sealed off more thoroughly, or the sanding has to be worked around someone in the house, that is real time.
Either side of a skim
What usually happens before it, or instead of it
A skim is often the last step rather than the only one. These are the pages it most often follows on from.
Ceiling repairs
Joint cracking, screw pops and failed old patches sorted out before a ceiling is brought back to one plane.
Ceiling repairsInternal solid plastering
Where a masonry wall needs real thickness rather than a thin finishing coat, which is a different material and method.
Solid plasteringTextured ceiling renewal
Sprayed and vermiculite ceiling coatings, which have to be assessed before anyone sands, scrapes or coats them.
Textured ceilingsQuestions
Skim coating questions we get asked
If yours is not here, ask it. We would rather answer it on the phone than have you guess.
What is skim coating, exactly?
It is a thin coat of finishing compound taken over an entire wall or ceiling rather than over the damaged part of it. The point is not to fill anything in particular. It is to make the whole plane read as one surface again, so nothing underneath it shows through the paint.
That is why it is measured by area rather than by the number of problems. Once the coat is being taken across a surface, it costs much the same whether that surface has one bad area or thirty.
Can you skim over a textured wall or ceiling?
Usually, and it is one of the most common reasons people ask for a skim. The coating is checked first to make sure it is firmly bonded and not powdering, then the high peaks are knocked back so the compound is not trying to bury them, and the surface is bonded and coated.
Two things to expect. Deeper texture needs more coats, so the timeline and the price both move with the depth rather than the area alone. And if the texture is a sprayed vermiculite or popcorn coating, nothing gets sanded or scraped until it has been assessed, which is covered on the textured ceiling page.
Will a skim coat fix cracks?
No, and this is the most important thing to be clear about. A skim is a millimetre or so of finishing material. It follows the surface underneath rather than correcting it, and a crack that is still moving will come straight back through a skim, often within a season.
Cracks are repaired first as their own piece of work: raked out, reinforced, set and dried. Then the skim goes over the whole plane. If a crack has already reopened once after a proper repair, that is movement in the building rather than a plaster fault, and it wants understanding before anyone coats over it.
Is skimming cheaper than re-sheeting?
Usually, and often by a good margin, because nothing comes off the wall, nothing goes to the tip and the room does not become a demolition site. It also keeps the existing cornice, the existing junctions and the existing services exactly where they are, which saves a lot of secondary work.
It stops being the cheaper answer when the surface underneath has genuinely failed: board that is soft, loose, water affected or so far out of shape that a thin coat cannot correct it. At that point the honest comparison is against relining the surface, and we would rather say so at the quote than take the skim job.
How long does a room take, and can I stay in the house?
A single room is commonly a few days rather than one day, because each coat has to dry before the next goes on. A light refresh over sound painted board is the quick end. Deep texture, a whole house or a high flatness finish is the long end, and the drying is what drives it either way.
You can normally stay in the house. We work room by room, seal the area off where we can and clean up at the end of each visit, so the rest of the home stays usable. The room being skimmed is out of action while it is wet, and sanding a whole plane makes a lot of fine dust, so tell us at the quote if that has to be worked around.
Do I have to repaint afterwards?
Yes. A skim leaves a fresh compound surface across the whole plane, and that has to be sealed and painted. It is one of the reasons a skim makes sense as part of a repaint rather than on its own: you were going to paint the room anyway, and the surface under the paint is now worth painting.
Give the surface proper drying time before the sealer goes on. Compound that is painted while it is still giving up moisture will show back, and the flatness you just paid for gets judged by how it looks under the finished paint.
Can you skim over old render or a hardwall wall?
Yes, and it is a common request in older Sydney houses where the walls are solid, sound and distinctly wavy. Hardwall and render take a finishing coat well, and a skim will straighten the read of the wall considerably without anyone touching the masonry behind it.
The preparation is different from board. Those surfaces are often thirsty and will pull moisture out of the compound too quickly, so they get sealed or bonded first. If the wall needs real thickness rather than a thin coat, that is solid plastering and a different conversation.
Get it priced
Send a photo with the light across the wall
A picture taken with a light raking along the surface tells us more than a straight-on shot ever will. With that and the room sizes we can tell you whether a skim is the right answer.