Ask any experienced painter what separates a paint job that looks great for a decade from one that starts failing within a couple of years, and the answer is almost always the same: preparation. The paint itself matters, but it’s the surface underneath that determines how well it adheres, how evenly it covers, and how long it holds. Here’s what proper interior prep actually involves.
Filling and Patching — More Than Just Holes
Most people know that holes and cracks need filling before painting. What’s less obvious is how much patching work an interior typically needs before it’s actually ready to paint — not just the obvious damage, but the dozens of small nail holes from picture hooks, hairline cracks along cornice and skirting joints, minor impact dents from furniture, and small areas of paint that are flaking or lifting along window and door frames.
Skipping or rushing this stage shows immediately under paint, particularly under low-sheen or matte finishes that don’t hide surface irregularities. A professional interior job involves a methodical check of every wall, ceiling, and trim surface before any paint is opened.
Sanding — The Step Most DIY Jobs Miss
Sanding serves two purposes: it smooths filled areas so they blend seamlessly with the surrounding surface, and it scuffs existing gloss surfaces so new paint has something to grip. Both are essential. Applying paint over a glossy existing surface without sanding it first is one of the most common reasons paint peels — the new coat has no mechanical key to adhere to and lifts off over time.
For timber surfaces like skirtings, architraves, and doors, sanding is even more critical. Timber expands and contracts with temperature and humidity, and without proper sanding and priming, paint on timber surfaces tends to crack along the grain rather than flexing with the movement.
Cleaning Before Painting
Grease, dust, and residue from cleaning products all prevent paint from adhering properly. Kitchen walls are particularly prone to grease buildup that’s invisible to the eye but causes paint to fish-eye or peel within months. A proper clean with a sugar soap solution — not just a wipe-down — before painting removes the contamination that causes these failures.
Bathroom walls present a similar issue with moisture and soap residue, and sometimes mould that needs treating with an anti-fungal solution before any primer or paint goes on.
Priming — When It’s Necessary and When It Isn’t
Modern premium paints have good coverage without a separate primer coat in many situations, but there are specific cases where priming is essential rather than optional: new plaster or plasterboard, which is porous and will absorb paint unevenly without sealing; bare timber, which needs a primer coat to prevent tannin bleed-through staining the topcoat; stained areas from water damage or smoke, where a stain-blocking primer prevents the stain from bleeding through multiple coats of topcoat paint; and very dark existing colours, where a tinted primer reduces the number of topcoats needed to achieve coverage.
Protecting What Isn’t Being Painted
Professional interior painters spend significant time masking and protecting floors, furniture, fittings, and surfaces adjacent to the work area before a brush touches a wall. This isn’t excessive caution — it’s the difference between a clean, professional result and a job that leaves paint spots on hardwood floors or skirting boards that were supposed to stay the same colour.
Drop sheets, masking tape applied correctly (not stretched, which causes bleed), and protective covers on light fittings and power points are standard practice rather than optional extras on a professional job.
What This Means for Your Home
When you get an interior painting quote from Brighto Painting, preparation time and materials are included in the price — not treated as an upsell. A job quoted to include proper prep is rarely the cheapest quote, but it’s consistently the one that looks better for longer. Contact us for a free interior painting assessment across your Adelaide home.