Preparation is 80% of a great paint job. These common prep mistakes sabotage results before the first coat goes on.
Colour Selection and Planning
Skipping cleaning is the most common prep mistake. Painting over dusty, greasy, or contaminated walls causes poor adhesion. Even walls that look clean should be wiped down with a TSP substitute solution before priming.
Skipping primer is the second most costly shortcut. Primer seals porous surfaces, blocks stains, and creates the adhesion layer that topcoats bond to. New drywall and previously unpainted surfaces always need primer.
Preparation Is Everything
Inadequate crack and hole repair creates visible imperfections under sheen finishes. Fill all holes with spackling or joint compound, sand flush when dry, and re-prime the repair before applying colour.
Failing to tape properly costs more time than it saves. Rushed masking produces cut lines that require touch-up more time-consuming than careful taping would have been. Use quality low-tack tape for delicate surfaces.
Professional Results That Last
Not testing colour on the actual wall before committing is a widespread mistake. Lighting, existing wall colour, and other room elements all affect how a paint colour looks. Apply a large sample patch and evaluate it in daylight and artificial light.
Painting in cold or humid conditions affects adhesion and curing. Interior painting in rooms below 10°C or in high-humidity conditions causes poor film formation. Ensure adequate temperature and ventilation.
Ignoring surface repairs on trim and moulding produces unprofessional results. Trim damage — dents, cracks, chips — must be filled and sanded smooth before painting for a quality finished appearance.
Key Takeaways
- Skipping cleaning is the most common prep mistake.
- Inadequate crack and hole repair creates visible imperfections under sheen finishes.
- Not testing colour on the actual wall before committing is a widespread mistake.
- D&D Interior Services serves Kitchener, Waterloo, Cambridge, Guelph and surrounding areas
- Get a free no-obligation quote — call or book online anytime
Sources & References
- Ontario Building Code — Relevant Standards & Guidelines
- D&D Interior Services field experience across Waterloo Region
