A successful mural installation starts well before the first section is positioned on the wall. The condition of the surface affects how evenly the mural sits, how clearly the design appears and whether problems such as bubbling, lifting or visible joins develop later.
Preparing a wall does not always mean completely replastering or repainting the room. It means identifying anything that could interfere with installation, correcting the important issues and giving your installer clear information about the site. Use the steps below to prepare a wall for mural installation with fewer surprises.
Assess the wall before doing any work
Begin by inspecting the entire wall in good light. Look for cracks, dents, flaking paint, loose wallpaper, mould, damp patches, grease and areas where the surface changes from one material to another. Check around skirting boards, corners, power points, windows and doors, as these locations often need extra attention.
Run your hand across the surface. A wall can look acceptable from a distance but still have ridges, powdery paint or small lumps that may show through the finished mural. Take photographs of anything unusual and send them to your mural provider or installer before preparing the surface. This is particularly useful in older homes, commercial buildings and renovated spaces where previous wall treatments may be hidden beneath newer paint.
Also confirm the wall dimensions, including the height at several points. Walls are not always perfectly square, and floors or ceilings may slope. Accurate measurements help with design planning, but the installer should make the final assessment before production or installation.
Make sure the surface is sound and stable
The wall must be firmly attached and able to accept the mural system being used. Remove loose or peeling paint and deal with wallpaper that is lifting, torn or poorly bonded. Do not simply paint over unstable layers, because the mural may adhere to the loose coating rather than to the wall itself.
Fill holes, dents and open cracks with a suitable repair compound, then allow the repairs to dry fully. Sand them smooth and remove all dust. Larger cracks, recurring cracks or movement around joins may need a qualified tradesperson rather than a quick patch. If the wall has been affected by water, repair the source of the moisture first. Installing over an active leak, damp plaster or mouldy surface is likely to create a bigger problem later.
Some surfaces require additional preparation. Very porous plasterboard, bare plaster or heavily repaired walls may need an appropriate primer or sealer. Glossy paint, textured coatings and unusual substrates can also affect adhesion. Ask the installer what preparation is suitable instead of choosing a product based only on its label.
Clean the wall properly
Dust, cooking residue, smoke, hand oils and cleaning-product residue can prevent a consistent bond. Vacuum the wall and nearby edges first, then wipe the surface with a suitable mild cleaning solution. Pay close attention to kitchens, restaurants, workshops and busy corridors, where grease or airborne residue may be more noticeable.
Allow the wall to dry completely before further preparation. Avoid leaving excess water in corners, around switches or along skirting boards. If mould is present, do not cover it with paint or a mural. Identify and address the moisture issue and use appropriate remediation methods before installation.
Choose the right paint finish and colour
A smooth, even, low-sheen painted surface is generally easier to prepare than a highly textured or glossy one. Follow the installer’s advice about the most suitable finish for the mural being installed. The correct choice can vary depending on the wall, the existing coating and the installation method.
If repainting is necessary, complete it well before installation and allow the coating to cure according to the paint manufacturer’s instructions. Fresh paint may feel dry while still releasing moisture or remaining vulnerable to marking. Painting only the visible centre of the wall can also create an uneven base if the mural does not cover every edge, so discuss the intended coverage first.
Strong colour changes may require careful planning. Dark paint, bright feature colours or patchy repairs can sometimes influence the appearance of a lighter mural. Ask whether the design or wall should be adjusted to account for the existing colour.
Plan around fixtures, fittings and access
Decide what will happen to shelves, artwork, mirrors, televisions, signs, curtain hardware and wall-mounted furniture before installation day. Remove items that obstruct the wall where possible, and make sure any remaining fixtures are clearly identified. Electrical outlets and switches may need covers removed by a suitably qualified person. Never attempt electrical work unless you are authorised and competent to do so.
Clear furniture away from the installation area and protect items that cannot be moved. Provide a safe, unobstructed path from the entry point to the wall. Let the installer know about stairs, narrow hallways, lifts, restricted parking, security procedures and building access hours. These practical details can affect the time required and may need to be considered in the installation quote.
For a workplace, school, healthcare environment or hospitality venue, plan around staff, visitors and customers. A temporary closure or staged installation may reduce disruption. You can explore suitable applications in commercial mural projects, school mural installations and other specialist settings before confirming your site plan.
Consider corners, edges and adjoining surfaces
Tell the installer whether the mural will stop at a corner, continue around it or meet another finish. Internal and external corners can require careful planning, particularly where walls are uneven. Skirting boards, cornices, architraves and trims may remain in place, be removed temporarily or require a neat cut around them.
Do not assume that a mural will cover adjoining walls, ceilings or floors. If you are planning a coordinated visual treatment, discuss each surface separately. For example, floor mural options involve different preparation considerations from a vertical wall and should not be treated as the same installation.
What to do the day before installation
- Remove loose objects, wall decorations and movable furniture from the work area.
- Check that repairs are smooth, dry and free from sanding dust.
- Confirm that paint, primer or sealer has had enough time to cure.
- Make sure the room is reasonably clean and has safe access.
- Keep the agreed wall clear and advise the installer about any last-minute changes.
- Have the approved design, wall measurements and site contact details available.
Keep pets and children away from the work area, and consider how ventilation, temperature and normal building activity may affect the installation environment. Your installer can advise on any specific conditions required for the selected mural system.
Common wall preparation mistakes to avoid
- Covering dampness: A mural is not a solution for leaks, condensation or rising damp.
- Painting immediately before installation: Allow the new coating to cure rather than relying on touch-dry paint.
- Leaving dust after sanding: Fine dust can interfere with adhesion and create a rough finish.
- Ignoring texture: Deep texture, heavy stippling and ridges may remain visible through the mural.
- Removing only obvious damage: Small loose areas can still cause larger failures if left underneath.
- Underestimating access: A clear wall is not enough if installers cannot safely reach it.
- Making unapproved last-minute changes: Moving fixtures or altering the wall dimensions can affect the prepared design.
Ask for a site assessment before installation
Every wall is different, so the most reliable preparation plan comes from discussing the site with your mural provider. Share wall photographs, dimensions, surface details and access information early. This helps identify whether cleaning, patching, priming, repainting, removal of an existing finish or professional trade work is needed.
For a residential project, you can review home mural ideas and applications while considering how the chosen design will work with your existing paint, lighting and furniture. Once the wall is ready and the site details are confirmed, installation is far more likely to proceed efficiently.
Ready to prepare your wall?
Send your wall details and project requirements through the Aussie Wall Print contact page to discuss the mural, surface condition and installation plan. It is better to ask about a questionable wall early than to discover a preparation issue on installation day.