A good exterior coating system on a well-prepared facade should last many years. Yet we regularly get called to Sydney buildings where the paint is peeling, blistering or chalking only a few years after a repaint. The owners usually blame the paint. In most cases, the paint was fine. The preparation was not.
Facade paint peeling early is almost always a symptom of something that happened, or did not happen, before the first coat went on. Here are the preparation mistakes we see most often, and what should have been done instead.
What early failure looks like
Paint failure shows up in a few recognisable ways. Each one points to a different cause:
- Peeling and flaking: the coating has lost adhesion, often because it was applied over dirt, chalk, old loose paint or a damp surface.
- Blistering: moisture or salts are pushing out from behind the coating.
- Cracking that follows the substrate: cracks in the render or concrete were painted over rather than repaired.
- Rust staining: corroding steel behind the surface, or untreated metal fixings.
- Patchy colour or sheen: unsealed repairs or uneven porosity absorbing the paint differently.
Mistake 1: Inadequate cleaning
Sydney facades collect salt, pollution, mould and chalk from old coatings, especially on coastal and harbourside buildings. If that layer is not removed, the new paint bonds to the contamination instead of the substrate. It looks fine on handover and starts lifting within a couple of years.
Proper preparation means pressure cleaning at a suitable pressure for the substrate, treating mould with an appropriate wash, and letting the surface dry fully before coating. Rushing the drying time on a shaded elevation is a common shortcut.
Mistake 2: Painting over loose or failing paint
A new coat is only as strong as what it sits on. If the existing paint is already losing adhesion, a fresh coat adds weight and tension and can pull more of it off. Loose and flaking areas need to be scraped back to a sound edge, the edges feathered, and bare areas primed with a product suited to the substrate.
Mistake 3: Covering cracks instead of repairing them
Fine hairline cracks in render can often be handled with a flexible filler and an elastomeric system. Wider or active cracks are different. They may indicate movement, a failed control joint or corroding reinforcement. Painting over them hides the problem for a season, then the crack reappears and water gets in behind the new coating.
Where cracking is accompanied by rust staining or drummy concrete, the cause needs to be investigated. Our page on concrete cancer repair in Sydney explains how those repairs are carried out before painting.
Mistake 4: Ignoring failed sealant and joints
Window perimeters, expansion joints and penetrations are some of the most common entry points for water on a facade. If old, cracked or debonded sealant is painted over rather than cut out and replaced, water keeps getting behind the paint film. The result is blistering and peeling around windows and joints, often within the first wet season.
If you are not sure whether the sealant on your building is due, see our article on signs your window sealant needs replacing.
Mistake 5: Skipping or mismatching the primer
Bare render, new patch repairs, concrete, fibre cement and metal all need specific primers or sealers. Patch repairs in particular are often more alkaline and more porous than the surrounding wall. Without the right sealer, the topcoat can fail over the repair or show as a visible patch. Metal elements need rust treatment and a compatible primer, not just a topcoat.
Mistake 6: Painting in the wrong conditions
Coating manufacturers specify temperature, humidity and surface moisture limits. Applying paint to a damp wall, in direct hot sun on a dark elevation, or late in the day when dew is coming can all affect adhesion and curing. On a tall building, conditions on one elevation can be very different from another at the same time, so the crew needs to plan the day around the sun and weather.
Mistake 7: Not following the specified system
A coating system is designed as a whole: primer, film build and number of coats. Thinning the paint too much, skipping a coat or mixing products from different systems reduces durability and can void the product warranty. Ask your contractor to name the system and confirm it in writing.
How access affects preparation quality
Preparation is slow, close-up work. On a high-rise, the access method affects how well it can be done. Rope access lets technicians work directly on each drop, cleaning, scraping, repairing and sealing within arm’s reach, then coating the same area once it is ready. It also makes it practical to photograph defects and preparation stages as the work progresses.
You can read more about how we approach high-rise painting and building facade painting in Sydney.
Frequently asked questions
Why is the paint peeling on our building after only a few years?
The most common causes are poor cleaning, painting over loose paint, moisture getting in through cracks or failed sealant, and missing or wrong primers. An inspection up close will usually show which one applies.
Can we just patch the areas that are peeling?
Sometimes, if the failure is limited and the cause is fixed first. If the cause is not addressed, the patch will fail the same way. Colour and sheen matching on older coatings can also be difficult.
How do we make sure preparation is done properly?
Get the preparation steps and coating system written into the scope, and ask for progress photos of each stage. Once the topcoat is on, photos are the only record of what was done underneath.
Talk to Ace Abseiling
Ace Abseiling is a Sydney painting and remedial contractor working on industrial rope access, holding NSW Contractor Licence 465770C and $20M public liability. If your facade is failing early or you want a repaint scoped properly from the start, contact us or call 1300 926 176.
