When Your Walls Need More Than Paint

We get calls every week from people who want a repaint but suspect their walls need more than just a fresh coat. They're usually right. Cracked plaster, water-damaged surfaces, holes from old fixings, or render that's separating from the substrate — none of these will be fixed by painting over them.

Here's how to tell what your walls actually need, and why getting it right before the paint goes on makes the difference between a finish that lasts and one that fails.

Filler vs. Plaster — When Each One Applies

Not every imperfection needs a plasterer. Small stuff — nail holes, minor dents, hairline cracks at cornice joins — can be filled with a quality interior filler, sanded flush, and painted over. That's standard preparation work and it's included in every paint job we quote.

Plaster repairs are a different scope. They're needed when the damage goes deeper than the surface:

• Holes through plasterboard — anything bigger than a 50-cent piece can't be filled. It needs a plasterboard patch cut in, taped, and set with joint compound.
• Large cracks — cracks wider than a few millimetres, or cracks that keep coming back after filling, usually indicate structural movement. They need to be chased out, reinforced with fibreglass tape, and properly set.
• Water damage — water-affected plaster swells, softens, and loses its bond. The damaged section needs cutting out and replacing, not just drying and painting over.
• Delaminating render — exterior cement render that sounds hollow when tapped has separated from the substrate. Painting over it just delays the inevitable — it will crack and fall away.

What Water Damage Actually Looks Like

Water damage is the one people most often underestimate. The visible stain on the ceiling or wall is just the surface. Underneath, the plasterboard or lath may be swollen, crumbly, or growing mould.

Before any repair, the source of the water needs to be fixed — a leaking roof, burst pipe, or failed waterproofing. We won't plaster or paint over active water ingress because the repair will fail.

Once the source is sorted and the area is dry, we cut back to sound plaster, patch the section, and seal with a stain-blocking primer before painting. Standard paint won't cover water stains — they bleed straight through without a barrier coat.

Cornices, Joins, and Movement Cracks

Older Sydney homes move. Foundations settle, timber frames expand and contract with the seasons, and concrete slabs shift slightly over time. The result is cracking at the weakest points — where walls meet ceilings, around door frames, and along cornice joins.

These cracks are cosmetic, not structural, but they look terrible and they collect dust. A quick fill-and-paint fix works for hairline cracks, but if the gap is wide or has been filled multiple times before, we cut the old filler out, apply flexible sealant or fibreglass tape, and set it properly. The goal is a repair that flexes with the building instead of cracking again in six months.

When Render Needs Attention

Exterior cement render takes a beating — especially on the coast. Over time it can crack, crumble at edges, or separate from the brickwork behind it.

Small render cracks can be filled and painted. But if the render is hollow (tap it — you'll hear the difference), soft, or crumbling, it needs cutting back and patching with new render before any paint goes on. Painting over failing render is a waste of money — the paint will crack and peel with the render underneath.

How We Handle It

We assess wall condition at the quoting stage. If we spot damage that needs plaster work, we'll tell you — along with what it'll cost and why it matters. We'd rather scope it properly upfront than discover problems once we've started.

Our plastering and painting are done by the same team, which means the plaster repairs are finished to a standard that's ready for paint — not just structurally sound, but smooth, primed, and invisible under the topcoat. When separate trades handle plastering and painting, the handover is where quality drops.

If you're noticing signs that your home needs attention, get in touch. We'll walk through the property, identify what needs repair versus what just needs a fresh coat, and give you one clear quote for the lot.