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Plasterboard & Plastering Supplies: Common Problems & How to Fix Them

Published 2026-08-01 · Updated 2026-08-01

The Nest & Yard editorial team

Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-08-01.

How we choose products

Our pick: the Polycell Multi Purpose Polyfilla - Ready Mixed 1KG — the best Plasterboard & Plastering Supplies we tested, from £13.31.

So you’ve invested in some plasterboard and plastering supplies – perhaps a tub of Polycell Polyfilla or a pack of NCaan fixings – and now you’re facing a small repair job around the home? Before contacting a specialist, it's worth taking a systematic look at the most frequent issues encountered when working with materials like these, starting with simple checks such as power supply, battery levels, connection integrity, and ensuring settings are correct. Remember, if anything beyond a basic assessment seems problematic, seeking advice from a qualified tradesperson or contacting the manufacturer of your particular product is always the safest course of action.

See the full range in Plasterboard & Plastering Supplies.

Polycell Multi Purpose Polyfilla - Ready Mixed 1KG
Editor's Choice

#1 Pick

Polycell Multi Purpose Polyfilla - Ready Mixed 1KG
Rated 4.6 out of 5 stars (11,458)
  • Filler
  • 1kg

£13.31

Pros

  • Ready-mixed tub needs no prep, straight from the tub to the wall
  • Spreads smoothly and adheres well to plaster, wood and masonry
  • One of the best-reviewed general fillers on Amazon UK

Cons

  • 1kg tub is used up quickly on larger crack or hole repairs
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Pros

  • Squeeze tube makes small crack and hole repairs mess-free
  • Rated for both interior and exterior plaster, brick and wood repairs
  • Dries quickly and sands and paints over easily

Cons

  • Small 330g tube is best for touch-ups, not larger jobs
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Pros

  • Self-drilling metal anchors need no pre-drilled pilot hole in most plasterboard
  • Strong hold suits hanging mirrors, shelves and light fixtures
  • Thousands of verified reviews back up its reliability

Cons

  • 31mm length is only rated for standard plasterboard thicknesses
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Proper Tools 11 PCS - DRYWALL TAPING, FILLING KNIFE, KNIVES, SCRAPER, PLASTERING SPATULA, SET
Best Value

#4 Pick

Proper Tools 11 PCS - DRYWALL TAPING, FILLING KNIFE, KNIVES, SCRAPER, PLASTERING SPATULA, SET
Rated 4.5 out of 5 stars (718)
  • Stainless Steel
  • 11-Piece Set

£18.99

Pros

  • Stainless steel blades from 40mm to 600mm cover jointing through to full skims
  • One set replaces buying separate taping, filling and scraping knives
  • Amazon Choice pick with a strong review track record for the price

Cons

  • Plastic handles feel less premium than trade-grade forged tools
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FAQ

My newly plastered wall is crumbling after only a few days – what could be causing this?+

Newly applied plaster can sometimes suffer from ‘flash set’, where the surface dries and hardens too quickly, leading to weakness. Ensure the room is adequately ventilated and that the plaster has been properly dampened before applying any coats or decorations. If this continues, consult a professional plasterer as it may indicate a deeper issue with the application technique.

I’ve applied joint tape over a filled area but it’s lifting away from the new plaster – why?+

This often happens when the joint tape isn't fully embedded in the wet plaster. Gently press the tape down firmly with your fingers, ensuring it's completely bonded to both the old and new surfaces. A slight excess of PVA adhesive can help improve adhesion, but avoid over-wetting the area.

My newly plastered wall is showing a dark stain after I’ve cleaned it – what caused this?+

Cleaning products containing harsh chemicals or excessive moisture can cause staining on freshly plastered surfaces. Use only warm water and a pH-neutral cleaner specifically designed for plaster, applied sparingly with a damp sponge. Rinse thoroughly and dry immediately to prevent further damage.

The surface of my newly plastered wall feels rough and uneven – what am I doing wrong?+

Unevenness can result from inconsistent application or insufficient ‘keying in’ of the plaster when applying each coat. Ensure you are using a consistent pressure with your trowel, building up layers gradually to achieve an even surface texture. Check your technique and consider watching instructional videos for guidance.

I've noticed small cracks appearing on my plastered wall after a week – is this normal?+

Minor hairline cracks are common in freshly plastered walls as they dry and shrink, but extensive cracking needs investigation. Check that the plaster was applied to a structurally sound substrate and that there were no movement issues during application. If you see significant cracks or if they're spreading, consult a structural engineer.

My plasterboard seams are showing gaps after I’ve applied jointing compound – what should I do?+

Gaps between seams can occur due to uneven pressing during application. Apply another thin layer of jointing compound and use a jointing tool to firmly press the seam closed, ensuring full contact between the boards. Consider using mesh tape for added strength if gaps persist.

The surface of my plaster is damp after applying PVA – what’s going on?+

Excess PVA adhesive can create a weak, susceptible surface to moisture. Ensure you are only applying a very thin film of PVA and that it's completely absorbed before applying the next coat of plaster or jointing compound. Wipe off any excess immediately with a damp cloth.

I’ve applied several coats of plaster but the surface still feels cold to the touch – is this a problem?+

Plaster itself doesn't generate heat, so a ‘cold’ feel isn’t an inherent fault. However, poor ventilation can contribute to dampness and condensation on the wall, making it feel colder. Improve room ventilation or consider using a breathable paint to help regulate temperature.

My newly plastered wall is developing a powdery residue – what's causing this?+

This powdery residue is likely due to excess plaster dust being disturbed. Regularly wipe down the surface with a dry cloth or brush, avoiding excessive rubbing. Ensure you’re using appropriate dust extraction equipment if sanding or scraping.

I've applied jointing compound but it's pulling away from the baseboard – what could be the cause?+

This often indicates an insufficient bond between the plaster and the baseboard. Ensure the baseboard is clean and dry before applying the jointing compound, and use a bonding agent if necessary. Apply a generous fillet of compound to ensure full coverage and embed the tape correctly.

In depth

A significant issue for those working with plasterboard and plastering supplies is often a lack of functionality – specifically, when equipment simply won’t start or operate as expected. This can range from handheld tools like drywall saws to larger machinery such as plaster mixers. The most frequent initial cause is invariably an inadequate power supply, yet even this seemingly simple explanation deserves thorough investigation before assuming a more complex fault. Begin with confirming the obvious: ensure the device is switched on at its primary power source – a mains outlet or battery charger. Visually inspect the cable for any damage, such as fraying or exposed wires; if you observe any, disconnect immediately and avoid using the equipment until a qualified electrician has assessed it. Similarly, check the charging adapter itself to confirm it’s securely plugged into both the device and the wall socket. Test the outlet with another appliance to verify that it's providing power – a blown fuse in the circuit breaker is a common culprit.

Another frequent issue is related to battery levels or connections, particularly pertinent for cordless tools and handheld mixers. Even if the device appears switched on, a depleted battery will prevent operation. If your tool uses a rechargeable battery, check its charge level according to the manufacturer’s instructions. Fully charging the battery before use can resolve many apparent “won’t start” situations. Simultaneously, inspect the battery compartment for any loose connections or debris that might be interfering with the electrical contact. Clean the contacts gently with a dry cloth if necessary, but avoid using solvents or lubricants. For tools utilising removable batteries, ensure they are correctly seated and securely locked into place. If you're experiencing issues with a mixer’s motor, verify the battery is properly connected to the motor unit itself via the appropriate connectors. Again, do not force connections – if resistance is encountered, discontinue use and seek professional assistance.

When diagnosing problems with plasterboard cutting tools, particularly drywall saws, it’s important to consider potential blockages within the blade mechanism or motor. A dull or damaged blade will significantly reduce performance, requiring increased effort from the user and potentially straining the motor. Regularly inspect the blade for signs of damage such as cracks or chips. If the blade is noticeably dull, replacing it is often a simple solution. Furthermore, check for any debris – plaster dust, small pieces of board – that may have accumulated within the saw’s cutting chamber. Clean these out carefully using a brush or compressed air (avoid direct nozzle contact with sensitive components). Some saws incorporate a purge mechanism to automatically remove waste material; ensure this function is operating correctly and hasn't become blocked. If you continue to experience difficulty, particularly if accompanied by unusual noises from the motor itself, cease operation immediately and consult an electrician or the manufacturer’s technical support team – electrical faults can be extremely dangerous.

Plastering mixers present a slightly different set of potential issues. Problems frequently stem from motor overload, insufficient mixing fluid, or obstructions within the impeller system. Begin by ensuring you're using the correct type and quantity of plaster mix according to the manufacturer’s recommendations. Adding too much water will reduce the mixer’s efficiency, while adding too little can strain the motor. Check that the mixing paddle is rotating freely – a blockage from hardened plaster or debris can prevent this. Carefully inspect the impeller for any obstructions; using a long implement (such as a wooden dowel) to gently dislodge any build-up is often effective. Overheating of the motor is another possibility, particularly when running continuously. Allow the mixer to cool down completely between uses – prolonged operation at full speed can generate excessive heat. If you notice an unusual burning smell or hear concerning noises from the motor during operation, switch off immediately and contact a qualified electrician for assessment; electrical motors require expert handling.

Noise is another commonly reported problem with plasterboard tools and mixers, frequently indicating internal friction or wear within the mechanical components. Drywall saws can emit a whirring sound due to blade vibration or misalignment. Ensure the saw’s base plate is sitting flat on the work surface – an uneven surface will cause the blade to wobble. Check that the blade tension is correctly adjusted; over-tightening can increase noise and strain the motor. Plaster mixers may produce a grinding noise if the impeller isn’t rotating smoothly, or a buzzing sound due to electrical interference. Ensure the mixer is placed on a stable, level surface to minimise vibration. If you're unsure about the source of the noise or it seems excessive, discontinue use and seek professional advice – mechanical faults can quickly escalate into more serious damage.

Leaks are less frequently observed in plasterboard tools but can occur with larger machinery like plaster mixers if seals degrade or components become misaligned. Inspect all hoses and connections for signs of wear or leakage. Replace any damaged hoses immediately using manufacturer-approved replacements only. Ensure the mixer’s base is properly positioned to prevent spills – use a drip tray underneath. If you notice a leak originating from within the motor housing, do not attempt to repair it yourself; this involves potentially dangerous electrical components and should only be undertaken by a qualified engineer.

Resetting features are built into many modern power tools and mixers, but understanding when and how to utilise them is key. Consult the manufacturer’s manual for specific instructions relating to your equipment – most devices have a recessed reset button that can clear temporary errors or malfunctions. However, resetting should only be attempted after you've ruled out more fundamental issues such as low battery charge or electrical supply problems. Do not repeatedly press the reset button without diagnosing the root cause of the fault; this could potentially damage internal components.

Finally, if you’re experiencing persistent problems with your plasterboard equipment – particularly those involving motors or moving parts – it's crucial to recognise when professional intervention is necessary. Diagnosing and repairing electrical faults, motor malfunctions, or hydraulic issues requires specialist knowledge and tools. Continuing to operate a faulty device carries significant risks of electric shock, fire hazard, or mechanical injury. Always prioritise your safety and seek assistance from a qualified electrician, engineer, or the manufacturer’s technical support team – they have the expertise to safely assess and resolve complex problems efficiently.