Quick answer: Plastering a wall yourself is doable on small patches and single walls if you work slowly and methodically, but the final finish is what shows once the paint goes on. Skimming, plasterboard fixing and getting a flat, flash-free surface take practice — for anything you’re selling on or want dead flat, a professional gib stopper is usually worth it.
Thinking of plastering a wall yourself? It’s more common than you’d think for Kiwis to have a go, and for a small repair it can be worth it. Where it gets tricky is the finish. A good plaster or gib-stopping job is invisible; a rushed one telegraphs through the paint under side light, and no topcoat hides it.
So before you buy a trowel, it helps to know what’s actually involved — the tools, the technique, and the honest point where DIY stops paying off. We’d normally steer first-timers away from a whole-room skim, but a patch or a single wall is a fair place to learn.
Tools and Materials for Plastering a Wall
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Get the kit right before you start. Most of it you can pick up from Mitre 10 or Bunnings:
- Spot board and hand board (hawk)
- Finishing trowel and bucket trowel
- Scraper
- 1″ and 4″ clean paint brushes
- Mixer (a paddle on a drill)
- Flexible bucket
GIB or plaster — know what you’re working with
In most New Zealand homes the walls are lined with GIB plasterboard, then the joints and screw heads are stopped and skimmed rather than fully plastered wet. Traditional wet plastering over solid walls is less common here. Knowing which job you’re doing changes your materials: jointing/stopping compound and paper tape for a plasterboard finish, versus a plaster mix for a solid-wall skim.
🎨 Painting tip: Buy premixed stopping compound for your first go. Getting the mix consistency right by hand is half the battle, and premix takes that variable out so you can focus on technique.
How to Plaster a Wall: The Technique
Plastering is one of those skills you can learn but only master with practice. A professional finish and a beginner’s finish sit side by side very obviously, and the quality of the plaster sets the ceiling for the quality of the paint job. If the finish really matters (you’re selling, or you want a dead-flat feature wall), it’s often better to get a qualified gib stopper on the tools and keep your effort for the painting.
Jobs a confident DIYer can take on
- Fixing plasterboard to a stud wall, ceiling frame or timber frame with screws or nails
- Skimming a plasterboard surface, or re-skimming a whole room
- Patching and repairing plaster surfaces with a skim finish
- Fixing plasterboard to solid walls with adhesive (“dot and dab” or dry lining)
Pay particular attention to the final finish and keep it even. A poor result costs more to fix than it would have to get a professional in first time — you’re then paying to strip back and redo.
How to Install Plasterboard (GIB)
If you’d rather avoid re-plastering over an old wall, fixing new plasterboard is often the easier path for a DIYer — it removes most of the wet-plastering prep and saves time. Plasterboard comes in a range of thicknesses and sizes, so check with the trade store or a local contractor on the right sheet for your wall.
Start by cutting the board to size. When fixing to a stud wall, cut to the centre of the noggin or joist. You’ll need:
- Rasp
- Straight edge
- Retractable knife
- Measuring tape
- Pencil
- Pad saw
Step 1
Measure and cut the sheets 12 mm short of the floor-to-ceiling height.
Step 2
Mark the cutting line on the ivory side of the board, then cut along it with a craft knife and straight edge.
Step 3
Turn the board over, fold along the cut to snap it, then run the knife through the paper backing.
Step 4
Get a second person to help fix the board — it’s much easier with two. Wedge a bolster chisel at the foot of the board, slide a timber off-cut underneath, and press down with your foot to force the board hard up against the ceiling. Fit it with the ivory side outwards.
Step 5
Fix with 32 mm plasterboard screws at roughly 150 mm intervals, 15 mm in from the edges. Carry on fitting whole boards the same way, cutting to fit above doorways and against adjacent walls. Notch the board around any skirting.
Step 6
Finish the joints with plasterboard tape for a smooth, crack-resistant result.
Applying the undercoat plaster
Load your hawk with two full trowels of mixed plaster. Spread it evenly and thinly — don’t lay it on too thick. Pull upwards, then work it side to side as you go, scraping excess back into the bucket. Repeat until you’ve covered the section with a smooth, even layer. After 2–3 sections the plaster starts to firm up.
Fill any narrow gaps, like the join between a doorframe and the wall, with a small tool. Once the first coat has firmed for around 20 minutes, smooth over any lumps with the trowel and work the corners, top and bottom of the wall, which are the fiddly bits. A damp brush helps even out the edges.
Scratching (devilling) the surface
Before the second coat, key the first coat so the next layer grips. The proper tool is a devilling float (a wooden float with nails set into it), but an old kitchen fork does the job at a small scale.
The second and final coat
After keying, apply a second, thinner coat. Slacken the mix with a little more water and aim for a thin layer around 2 mm. Let it firm slightly, then move to finishing.
Final Finish and Prepping for Paint
Flatten any bumps while the plaster is still slightly wet. Once it hardens, sand back the excess and even out the surface before you paint or paper. This sanding-and-checking stage is where DIY jobs are won or lost — run a light across the wall at a low angle and any ridges or hollows will show up as shadows.
Why the finish matters so much under paint
Paint is unforgiving of a poor substrate. Low-sheen and flat finishes hide minor imperfections better than gloss or semi-gloss (our guide to interior paint finishes sets out how much each one forgives), but nothing rescues a wavy skim or a proud joint. If you’re chasing a dead-flat, gallery-smooth result (common in modern Auckland interiors), that’s a Level 5 stopping finish, and it’s genuinely hard to achieve by hand without experience.
Important note: Prime new plaster and fresh stopping before your topcoat. Bare plaster and jointing compound are absorbent, and painting straight over them causes flashing — visible patches where the sheen and colour differ. A sealer or primer evens out the porosity first.
Plastering is a specialist trade most people prefer to leave to the experts. But if you’re handy, patient, and willing to work slowly, a patch or single wall is within reach of a careful DIYer. If you get stuck or the job’s bigger than you thought, feel free to get in touch. And if you’re weighing up the cost of getting a professional in, our guide to gib stopping costs in Auckland sets out what to expect. You can also get a quick estimate with our plastering cost calculator.
How to Replaster an Existing Wall
Most guides to plastering assume bare framing and new sheets. That is not the job most Auckland homeowners actually have. The wall is already there, already painted, and the problem is that it has stopped looking flat: filled picture hooks, a patched-over doorway, hairline cracks along the stopped joints, or the shallow ripple left behind after wallpaper came off. Replastering an existing wall is a different exercise from stopping a new one, and the method below is the one that applies to a lived-in house.
Replaster, skim or patch: what your wall actually needs
Three jobs all get called “replastering” and they are not interchangeable. A patch is local: you cut back the damage, fill, feather the edges out past the repair and sand. A skim coat is a thin coat over the whole wall to reset the surface to one plane, which is what you want when a wall has many small defects instead of one big one. A full replaster means the existing lining is coming off, either because it is loose, water-damaged, or so far out of level that no coat is going to rescue it.
The test is simple and it takes two minutes. Turn off the room light, hold a torch flat against the wall so the beam rakes across the surface, and walk it along. Isolated shadows in one or two places means patching. Shadows scattered across the whole wall, or old repairs showing as low spots wherever a previous owner has filled something, means skimming. If the lining sounds hollow when you knock it, or moves under hand pressure, stop and get it looked at before you coat anything: a skim adds weight to a wall that is already failing.
How to skim coat a painted wall
The instinct is to reach for stopping compound and trowel it over the paint. It will stick, but the finish is only as flat as your trowel work, and a hand skim across a whole wall is the hardest thing on this page to do well. There is a roller-applied route that is far more forgiving, and it is what a lot of Auckland stoppers now use on repaint jobs.
Resene Broadwall Surface Prep & Seal is made for roller application, and its data sheet lists among its performance points that it will “upgrade level of finish of existing painted walls” as well as achieve a level 5 finish on paperfaced plasterboard. It is sandable, its minimum recoat time is 6 hours, and its theoretical coverage is 4 square metres per litre at 110 microns. That is a much heavier film than a normal sealer, which is exactly why it fills. Resene Broadwall 3 in 1 does a comparable job as a wall surfacer at 200 microns and 2.5 square metres per litre unthinned, with a 4 hour minimum recoat.
Read those coverage figures before you buy anything. At 4 square metres per litre, a single 12 square metre wall is roughly 3 litres per coat, so a whole room is a very different shopping list from a normal repaint. That number is the one people get wrong, and it is why a “quick skim” turns into two trips to the trade counter.
The sequence on a painted wall runs: wash off grease and dust and let it dry, sand the whole surface so it is keyed and any proud filler is flat, fill and let the fills go off properly, then apply the surfacer with a roller and lay it off. Sand between coats rather than trying to build thickness in one pass. Check under raking light again before you prime, because a surfacer flattens a wall beautifully and will still hold a ridge you rolled in and did not see.
🎨 Painting tip: Never skim a wall you have not sanded. Modern low-sheen and semi-gloss paints are tight surfaces, and a surfacer or compound laid straight over an unsanded sheen is the failure that shows up months later as peeling sheets rather than as a bad finish on the day.
Filling holes and cracks before you skim
Fill first, coat second. Anything you leave will telegraph through, because a skim coat is too thin to bridge it.
Screw holes and picture hooks take a single pass of lightweight filler, sanded flush once dry. Anything wider than a finger needs backing: cut the hole square, fit an offcut of plasterboard behind it or a patch panel into the opening, tape the perimeter with paper tape and compound, then build up in two or three thin coats, never one thick one. Thick fills shrink, and a shrunken fill under a fresh skim leaves a visible dish exactly where you were trying to hide something.
Hairline cracks along a stopped joint are usually movement rather than a failed joint. Rake the crack open slightly, tape it with paper tape bedded in compound, then coat over it. Filler alone on a live joint comes back within a year. Cracks that run diagonally from the corner of a door or window opening, that keep reopening after repair, or that arrive alongside sticking doors or moving floors are a structural question before they are a plastering one, and they need a builder’s eye before anyone starts coating them.
Villa walls: fibrous plaster, scrim and lath
Pre-1940s Auckland homes are the exception to almost everything above. Instead of GIB you are likely to find fibrous plaster sheets, or older lath and plaster with hessian scrim over the joints and paper over the scrim. Both behave differently from modern plasterboard: they are more brittle around old fixings, they are far more absorbent, and old repairs tend to sit proud rather than flush.
There are two practical consequences. The surface drinks product, so a sealer coat ahead of any surfacer is not optional on old plaster, and the coverage you get will be worse than the data sheet figure. And scrimmed joints move seasonally, so skimming over an open scrim joint without taping it first simply gives the crack a fresh surface to reappear through. If you are working on a character home, our guide to painting an Auckland villa covers how these surfaces behave once paint goes on.
Important note: Older Auckland homes can carry lead-based paint, and older linings and textured ceilings can contain asbestos. Sanding either one dry is the wrong way to find out. If the house is old and you are about to sand a whole wall back, have the surface tested before you start rather than assuming it is clear.
When replastering is not the answer
Sometimes the cheapest path is to stop trying to save the lining. If the wall is out of level by more than a skim can absorb, if the board is water-damaged, or if you would be chasing a dead-flat result across a whole room by hand, sheeting over or replacing the lining is usually faster and lands flatter. Fixing new plasterboard is covered further up this page, and for a DIYer it is genuinely the easier route.
The other honest limit is the finish standard. A skim that reads fine in a hallway will not survive a long north-facing wall in a modern open-plan living room, where low-angle afternoon light does the same job as your torch test. That is where the difference between a level 4 and a level 5 stopping finish stops being jargon and starts being the reason a repaint looks considered or looks rushed. If the wall will be seen in that light and you want it right first time, this is the point to hand it to the crew who skim and re-stop tired walls ahead of a repaint rather than learn on it.
Ceilings follow the same principles but are considerably harder, because you are working overhead and gravity is not helping. We have covered that separately in our guide to plastering a ceiling, which also deals with cracks, water stains and textured ceilings in older homes.
Frequently Asked Questions
Can I plaster a wall myself?
Yes, for small patches and single walls a careful DIYer can plaster or stop a wall, especially over plasterboard. Whole-room skimming and dead-flat Level 5 finishes are much harder and take practice. The finish is what shows once the paint goes on, so if the result really matters, whether you are selling or want a flawless feature wall, a professional gib stopper is usually worth it.
What tools do I need to plaster a wall?
A basic plastering kit is a spot board, hand board (hawk), a finishing trowel and bucket trowel, a scraper, 1-inch and 4-inch brushes, a mixing paddle and a flexible bucket. For fixing plasterboard you'll also want a rasp, straight edge, retractable knife, measuring tape and pad saw. Most of it is available at Mitre 10 or Bunnings.
What's the difference between plastering and gib stopping?
Plastering usually means applying a wet plaster coat to a wall, while gib stopping is finishing the joints, screw heads and surface of GIB plasterboard so it's ready to paint. Most modern New Zealand homes are lined with plasterboard and stopped rather than fully wet-plastered, so for interior work you're most often gib stopping.
How many coats of plaster does a wall need?
A typical skim is two coats — an undercoat spread evenly and keyed, then a thinner finishing coat around 2 mm. Between them you scratch or devil the first coat so the second grips. Once dry, you sand back and check for flatness before priming and painting.
Do I need to prime new plaster before painting?
Yes. Bare plaster and fresh stopping compound are porous, and painting straight over them causes flashing — patchy differences in sheen and colour. Seal or prime the surface first so the topcoat sits evenly, then apply your finish coats. This step is one of the most common things DIYers skip and regret.
How long does plaster take to dry before painting?
It varies with the product, thickness and conditions, but you should let a skim fully dry and harden before sanding, priming and painting rather than rushing it. Painting over plaster that isn't fully cured traps moisture and leads to adhesion and flashing problems. Follow the product's recommended drying time and make sure the surface is dry to the touch and no longer cool.
How much does it cost to get a wall professionally plastered in Auckland?
It depends on the size of the job, the condition of the surface, and the finish level required — a straightforward patch is very different from re-stopping a whole room to a Level 5 finish. For a realistic picture, see our Auckland gib stopping cost guide or use our plastering cost calculator for a quick estimate, then get an on-site quote to confirm.
What is a Level 5 plaster finish?
Level 5 is the highest standard of gib stopping — a skim coat over the entire surface for a dead-flat result with no visible joints or fastener marks under any lighting. It's often specified in modern homes with large windows and low-angle light, or where a gloss or semi-gloss paint would expose lesser finishes. It's difficult to achieve consistently without professional experience.
Should I plaster or paint first?
Plaster first, always. The plastering or stopping creates the surface; painting is the finish over it. Once the plaster is dry, sanded flat and primed, you paint. Trying to paint over an unfinished or unsanded plaster surface just locks in the imperfections.
How do you replaster an existing wall?
Start by testing the wall with a torch held flat against the surface so the light rakes across it. Isolated shadows mean a patch; shadows across the whole wall mean a skim coat. Wash and sand the existing paint so it is keyed, fill and tape any holes or cracks and let the fills go off, then apply a roller-applied surfacer such as Resene Broadwall Surface Prep and Seal, sanding between coats rather than building thickness in one pass. Seal before you topcoat. If the lining sounds hollow or moves under hand pressure, get it assessed before coating it.
Can you plaster over a painted wall?
Yes, provided you sand the paint first. Modern low-sheen and semi-gloss paints are tight surfaces, and compound or surfacer laid straight over an unsanded sheen can peel off in sheets months later. Sand the whole wall, remove the dust, then coat. Resene lists upgrading the level of finish of existing painted walls among the uses for its Broadwall Surface Prep and Seal, so it is a recognised system rather than a workaround.
What is the difference between skimming and replastering?
Skimming is a thin coat applied over an existing lining to reset the surface to one flat plane. Replastering, used strictly, means the existing lining comes off and is replaced, usually because it is loose, water-damaged or too far out of level to save. Most jobs homeowners call replastering are actually skims. Skimming is cheaper and far less disruptive, so it is worth establishing which one you are quoting before comparing prices.
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