Top 10 Costly or Frequent Painting Mistakes

1. Skipping or using cheap/bad primer
   Dark colors bleed through, new drywall flashes, tannins bleed from wood, stains reappear.
   Fix: Always prime new drywall, patches, wood knots, smoke/water stains, and drastic color changes with the correct primer (PVA, 123, oil-based, shellac, etc.).
2. Not prepping properly (or at all)
   Painting over dirt, grease, loose paint, glossy surfaces, or mildew = peeling in months.
   Worst offenders: kitchens, bathrooms, exteriors, and glossy trim painted with latex without sanding/deglossing.
3. Poor or no patching & sanding
   Nail holes, dents, and bad seams telegraph through the finish coat.
   Pro tip: Sand patches smooth with 120–150 grit and spot-prime them.
4. Cutting corners on protection & masking
   Paint splatter on floors, countertops, hardwood, or furniture = angry customers and expensive repairs.
   Cheap blue tape bleeding and skipping plastic and drop cloths are common culprits.
5. Painting in bad conditions
   Too cold (<50 °F), too hot (>90 °F), high humidity, or direct sun = lap marks, poor adhesion, blistering, wrinkling.
   Latex paint especially hates cold and humidity.
6. Wrong sheen in the wrong place
   Flat paint in kitchens/bathrooms/kids’ rooms = impossible to clean.
   High gloss or semi-gloss on imperfect walls = every flaw magnified.
7. Over-thinning paint or wrong roller nap
   Thinning too much = runs and poor hide.
   ⅜″ nap on textured walls = streaks; ¾″+ nap on smooth drywall = orange-peel.
8. Not back-rolling after spraying
   Spraying without immediate back-rolling = pinholes, poor adhesion, and future mildew (especially on stucco/porous siding).
9. Bad color choices or no real-life sampling
   Picking from tiny chips or screens = “it looked beige online, now it’s peach!”
   Always test sample quarts on 3×3 ft boards and view at different times of day.
10. Rushing between coats / insufficient dry time
    Second coat too soon = wrinkling, pulling, lifting.
    Moving furniture or hanging pictures too early = dents and gouges.

Avoid these 10 (+5) mistakes and you’ll instantly be in the top 10% of painters.