Here's the thing most people learn the hard way: painting is maybe 20% of a good paint job. The other 80% is prep. The actual rolling-on of colour is the fun, fast part. Skip or rush the preparation, though, and even the best paint will peel, streak or look patchy within months. These are the seven prep mistakes we see most often.
1. Not cleaning the surface first
Paint needs a clean surface to grip. Dust, grease, mould or grime — common in our humid climate — stops it bonding, and the new coat will lift or flake. Walls need washing and drying properly before a brush goes anywhere near them.
2. Painting over flaking or peeling paint
Fresh paint over loose old paint just comes away with it. Anything flaking has to be scraped and sanded back to a sound surface first. It's tedious, it's the part everyone wants to skip, and it's exactly why so many shortcut jobs fail.
3. Skipping the filler and sanding
Cracks, holes and dents don't hide under paint — they get highlighted by it. Filling, then sanding smooth, is what gives you that flawless finish. Miss it and every imperfection is there forever, lit up by the new colour.
4. Not priming when you should
Bare timber, patched filler, stains, and big colour changes all usually need a primer. Skipping it leads to uneven colour, patchy sheen, stains bleeding through, and poor durability. Primer isn't an upsell — it's what the topcoat needs to sit on.
5. Forgetting to mask and protect properly
Rushing the tape, skimping on drop sheets, not removing or covering fittings — this is where DIY jobs start to look DIY. Clean lines and no splatter come from patient masking, not a steady hand alone.
6. Ignoring the weather and conditions
Painting in high humidity, in direct heat, or when rain's coming sabotages the job before you start. (We go deep on this in our Cairns climate guide — it matters more up here than almost anywhere.)
7. Using cheap tools and paint
Bargain rollers shed fluff into your finish; cheap brushes leave streaks; low-grade paint fades and wears fast in our sun. Good tools and a quality paint rated for our conditions make the work easier and the result last longer.
When people ask what they're paying a painter for, this is most of the answer. Not the painting — the prep. The cleaning, scraping, filling, sanding, priming and masking that's invisible once it's done, but is the entire reason a professional finish looks sharp and lasts for years.
Doing it yourself? You've got this.
None of this is meant to scare you off — a careful DIYer who respects the prep can get a genuinely great result on the right job. Take your time on the boring 80%, and the fun 20% will look fantastic.
Rather skip the scraping and sanding?
Prep is exactly what we do properly so the finish lasts. Tell us about your project and we'll give you an honest, free quote.