Bad painting advice spreads fast. It gets passed on by well-meaning friends, repeated in DIY forums, and followed confidently by homeowners who end up with peeling walls, patchy finishes, and wasted weekends.
Before your next project, whether a single room refresh or a full home renovation in London, here are ten house painting myths worth leaving behind for good.
Myth 1: Expensive Paint Always Covers in One Coat
Premium paint is worth buying. But one coat is rarely enough in real-world conditions.
Coverage claims on tins are tested on perfectly sealed, laboratory-prepared surfaces. London walls, repaired, repainted multiple times, uneven in places, almost always need two coats for a consistent finish. Budget for two from the start.
Myth 2: Primer Is Optional If the Paint Says Self-Priming
Self-priming paint works in ideal conditions. Most walls are not ideal conditions.
Fresh plaster, bare wood, significant colour changes, and any surface with stains or marks all require a dedicated primer. Without it, paint absorbs unevenly, adhesion suffers, and the finish deteriorates far sooner than it should.
Myth 3: Tape Should Come Off When the Paint Is Dry
This is one of the most common house painting mistakes, and one of the easiest to avoid.
Dried paint forms a film across both the tape and the wall. Peeling it away pulls that film with it, leaving a rough, jagged edge. Remove tape while the final coat is still slightly wet, pulling back at a 45-degree angle slowly and steadily. The result is a clean, sharp line every time.
Myth 4: Ceilings Must Always Be White
White ceilings are a habit, not a rule.
Painting the ceiling in the same tone as the walls, colour drenching, creates a cocooning effect that works beautifully in living rooms and bedrooms. In a smaller room, a ceiling painted slightly lighter than the walls draws the eye upward and makes the space feel taller. It is one of the most affordable home design ideas available to any homeowner.
Myth 5: The Colour on the Card Is the Colour You Will Get
Paint colours behave completely differently once they are on your walls.
Natural light, ceiling height, flooring tone, and the colours in adjoining rooms all affect how a shade reads in a space. A warm grey that looks sophisticated in a showroom can appear cold and flat in a north-facing room. Always test large swatches on the actual wall and observe them at different times of day before committing.
Myth 6: You Can Paint Straight Over Old Paint
Only if the existing surface is sound, clean, and well-adhered.
Flaking paint must be fully removed before anything new goes over it. Glossy surfaces need light sanding to give the new coat something to grip. Skipping surface preparation is the single most reliable way to ensure a freshly decorated room looks tired within twelve months.
Myth 7: More Coats Always Mean Better Results
More coats create more problems when the surface preparation has not been done properly.
Build-up from too many layers can cause paint to crack, bubble, and peel. Two properly applied coats on a well-prepared surface will always outperform four coats applied carelessly.
Myth 8: Any Brush or Roller Will Do the Job
The wrong tools produce visible results, and not in a good way.
Synthetic brushes are suited to water-based paints. Natural bristle brushes perform better with oil-based paints. Short-nap rollers give a smooth finish on flat walls. Long-nap rollers are necessary for textured or heavily plastered surfaces. Using the wrong roller on a smooth wall leaves a stippled texture that no amount of additional coats will disguise.
Myth 9: You Cannot Paint in Winter or Humid Conditions
Temperature and humidity affect drying times, not whether the paint will work at all.
Most water-based paints perform well down to around 10°C. The key requirements are adequate ventilation, avoiding direct condensation on the surface, and allowing longer drying time between coats. For exterior painting in London, dry days above 5°C with low humidity are the practical threshold.
Myth 10: Painting Is Always a Straightforward DIY Project
Simple rooms in good condition, yes. Everything else deserves more careful consideration.
High ceilings, complex cornicing, significant colour changes, specialist finishes, and rooms forming part of a wider residential interior design project are all situations where professional decorating pays for itself in the quality of the finished result.
Good painting comes down to preparation, the right materials, and following advice that is actually correct. If your painting project is part of a wider renovation or redesign, book a free consultation with Oraanj Interiors and we will help you plan a result worth living in.
