A fresh coat of paint only performs as well as the surface underneath it. Skip preparation and even premium paint will crack, peel or show every imperfection within a year or two. For homeowners and landlords in St James, where post-war development has left the suburb with a mix of established homes that have often been painted many times over, getting the preparation right matters more than the brand of paint you choose.
Why surface preparation determines how long your paint lasts
Older homes in St James frequently present surfaces that have accumulated multiple paint layers over decades, along with the minor cracking and settlement common to established residential properties. If the existing finish is flaking, chalky or poorly bonded, a new coat applied on top will pull away with it. Cracks and holes left unfilled will telegraph through any number of finish coats, and as the substrate moves slightly with Perth’s temperature swings between summer and winter, those cracks will reappear quickly. Addressing these problems before the first drop of finish coat goes on is what distinguishes a paint job that holds up for years from one that needs attention again within a season.
Cleaning and washing surfaces before you start
Dust, grease and surface contamination are the most common causes of adhesion failure, yet they are easy to overlook because a wall can look clean to the eye. In kitchens and areas near cooking surfaces, an invisible film of grease will cause paint to fish eye or lift within months. Sugar soap solution, applied with a sponge and rinsed off thoroughly, removes most household grease and grime. Bathrooms and laundries may also carry mould or mildew, which must be treated with a fungicidal wash rather than simply painted over. Painting over active mould will not kill it; the growth will continue under the new finish and eventually push through. Allow surfaces to dry completely before moving to the next step, as moisture trapped under paint is a common cause of blistering.
Filling cracks, holes and surface damage
St James developed primarily after World War Two as part of Perth’s post-war housing expansion, meaning many homes in the suburb are well established properties with the minor surface wear that comes with age. Hairline cracks in older plaster or render need to be raked out slightly with a scraper, primed and filled with a flexible filler rather than a rigid compound, because rigid filler will crack again as the substrate moves with seasonal temperature changes. Larger holes from removed fixings or pipework require backing and a multi-coat fill, sanded back between coats so each layer cures properly. Attempting to fill a deep hole in one pass almost always results in shrinkage and a visible indentation once painted. Skirting board joints, cornice junctions and door frame gaps are also worth filling and sanding before painting, as these edges catch light and any gaps become obvious under a flat or low sheen finish.
Does every interior surface need to be sanded?
Not every surface needs heavy sanding, but most need at least a light sand to create a mechanical key for the new paint. Glossy or semi-gloss finishes on doors, trims and skirting boards must be sanded or de-glossed before repainting, otherwise the new coat will not bond and may peel away in sheets. Walls in good condition that carry a low sheen finish typically need only a light scuff sand, while walls with multiple old coats building up a ridged or uneven texture may need more thorough sanding to flatten the surface. Dust created by sanding must be wiped down completely before priming, as even a thin layer of sanding dust is enough to compromise adhesion.
When primer is necessary and when it can be skipped
Primer is not always required on a wall that has been painted before and is in good condition, but there are several situations where skipping it is a mistake. New plasterboard is highly porous and will absorb finish coats unevenly without a sealer coat, resulting in a patchy appearance that more finish coats will not correct. Filled areas, bare timber and surfaces stripped back to raw substrate all need priming so the finish coat applies evenly. If you are making a significant colour change, a tinted primer can reduce the number of finish coats needed to achieve full coverage. For walls where water damage has been repaired, a stain blocking primer prevents old watermarks from bleeding through the new finish coat over time.
Protecting floors, furniture and surrounding areas
Preparation also means protecting everything that is not being painted. Drop sheets on floors, masking tape along skirting boards and cornices, and plastic sheeting over furniture and fittings are standard practice on a well run interior job. In St James rentals and established homes where floor coverings may be difficult to replace, this step is worth taking seriously. Paint splatter on timber floors or carpet is difficult to remove without causing further damage, and overspray on window glass, light fittings or cabinetry takes additional time to clean off. A painter who rushes the masking and protection stage to save time usually creates more work and cost at the clean up end.
What a professional interior preparation process covers
On a typical interior repaint, a professional team will wash surfaces, carry out all crack filling and minor repairs, sand as required, wipe down dust, apply primer to bare or filled areas, and mask off surfaces before any finish coat is applied. Recommended Painters WA prepares each area before painting begins, covering walls, ceilings, doors, door frames, skirting boards, trims and other interior surfaces, with the aim of achieving smooth, consistent coverage and a durable finish. With more than 25 years of experience delivering interior painting services across Perth for homes and commercial properties, the team understands that the preparation stage is where a long lasting result is won or lost. For renovation projects where new and existing surfaces meet, careful preparation is particularly important because different substrates absorb paint at different rates, and without thorough work at the joins, the transition between old and new will remain visible regardless of how many finish coats are applied.
If you are a homeowner, landlord or property manager in St James looking for a painting team with a thorough approach to surface preparation, Recommended Painters WA services St James and surrounding suburbs including Victoria Park. Getting preparation done properly once is always more cost effective than repainting a surface that has failed because the groundwork was rushed. Call the team on 0412 691 750, available Monday to Sunday from 7:00am to 5:00pm, to arrange an obligation free quote.
Frequently asked questions
Do I need to wash my walls before repainting?
Yes. Grease, dust and surface contamination prevent paint from bonding properly. Sugar soap is effective for most interior walls, and areas with mould should be treated with a fungicidal wash first. Skipping this step is one of the most common reasons a new paint job fails early.
How long does surface preparation take compared to the actual painting?
On a typical residential repaint, preparation can take as long as or longer than applying the finish coats, particularly in older homes with cracks, multiple old paint layers or surface damage that needs repairing. Rushing the preparation stage shortens the life of the entire job.
Can I paint over old peeling paint?
No. Peeling or poorly adhered paint needs to be removed before anything new is applied. Painting over it will result in the new coat lifting away along with the old finish. The loose material should be scraped back to a sound edge, the area filled and sanded smooth, and primer applied before the finish coat goes on.
Do filled patches need primer before the top coat?
Yes. Filled areas are more porous than the surrounding painted surface and will absorb finish coat paint unevenly, leaving dull or patchy spots. A spot prime on each filled area before the finish coat ensures the surface absorbs paint at a consistent rate and produces an even result.
Is surface preparation included when I hire a professional painter in St James?
It should be, and confirming this when you request quotes is worthwhile. Recommended Painters WA prepares surfaces before painting begins, addressing tasks such as filling cracks and holes, sanding, cleaning and applying primer where required. With over 25 years of experience across Perth metropolitan properties, the team can assess the condition of your surfaces during a quote inspection and outline exactly what preparation your job needs before any painting starts. Call 0412 691 750 or visit the contact page to arrange a free quote.