Even the most careful painters can run into trouble—paint drips, roller marks, uneven coverage, or visible brush strokes can all happen to anyone. The good news is that most of these issues are easy to fix with the right techniques and tools. Whether you’re a DIYer or planning to hire a professional, this guide will help you get a flawless finish every time.
Why do painting mistakes happen?
Painting mistakes usually result from rushing the process, using improper tools, or skipping preparation steps. Common culprits include:
- Applying paint too thickly
- Failing to stir paint thoroughly
- Painting in poor lighting or unsuitable weather
- Skipping primer or surface cleaning
- Not allowing enough drying time between coats
Randall’s experts recommend using premium paints and quality applicators to minimize errors. Explore our professional-grade products in the Paint Collections
How do you fix paint drips or runs?
Drips happen when too much paint is applied at once or when the roller or brush is overloaded. Here’s how to fix them:
If the paint is still wet:
- Use a dry brush or roller to gently smooth out the drip before it sets.
If the paint is dry:
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Lightly sand the area with fine-grit sandpaper (220 grit) until smooth.
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Wipe away dust with a damp cloth.
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Touch up with a thin coat of paint and blend it evenly.
For best results, apply paint in multiple thin layers rather than one heavy coat.
How can you fix uneven coverage or patchy paint?
Uneven coverage often happens when the paint isn’t stirred properly or the roller is underloaded. It can also appear when painting over dark colours without primer.
Fix it by:
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Allowing the first coat to dry completely.
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Applying a second thin, even coat in the same direction.
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If the issue persists, apply a coat of primer first, then repaint.
Using a quality roller and primer from Randall’s ensures consistent coverage and true colour results.
What causes roller marks or lap lines—and how do you prevent them?
Roller marks (also called lap lines) occur when sections of paint overlap after drying.
To fix:
- Lightly sand visible lines once dry, then repaint the area with even pressure.
To prevent:
- Keep a wet edge by working quickly in small sections.
- Roll from top to bottom in long, even strokes.
- Avoid painting in extreme heat or direct sunlight, which causes paint to dry too fast.
How do you fix brush strokes on walls or trim?
Visible brush marks are common when using cheap brushes, thick paint, or applying uneven pressure.
To fix:
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Wait for the paint to dry.
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Sand gently along the grain (for trim) or in circular motions (for walls).
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Wipe away dust and repaint with a high-quality brush, applying light, consistent strokes.
For smooth finishes on doors or trim, consider self-leveling paints or foam rollers, both available at Randall’s stores.
How can you fix paint bubbling or peeling?
Bubbles form when moisture or air gets trapped beneath the paint layer.
To fix:
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Scrape away loose paint.
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Sand the area until smooth.
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Clean and dry the wall completely.
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Apply a stain-blocking primer before repainting.
To prevent bubbling, avoid painting on damp surfaces or in high humidity. For Ottawa’s variable climate, Randall’s experts can recommend moisture-resistant primers and paints.
How do you repair paint streaks or flashing?
“Flashing” appears as shiny or dull patches on walls, often due to uneven application or missed spots.
To fix:
- Repaint the wall using consistent roller pressure.
- Maintain a wet edge to blend overlapping areas.
- Use the same type and sheen of paint across all coats.
What should you do if your paint colour looks uneven after drying?
Paint can look blotchy if it’s applied over unprimed or patched areas. The fix is simple:
- Apply one coat of high-quality primer, then repaint.
- Ensure the surface is clean, smooth, and consistent in texture before painting.
Primer helps unify absorption, allowing the final colour to appear rich and even.
When should you call a professional painter?
If your walls have persistent bubbling, peeling, or visible imperfections after multiple touch-ups, it may be time to bring in a pro. Professional painters can identify underlying issues like humidity, poor surface prep, or incompatible coatings.
Visit our Services Pageor complete a Painter Order Formto connect with experienced painters who can restore your walls quickly and professionally.
Get Expert Advice and Quality Supplies at Randall’s
Fixing paint mistakes is easier with the right guidance and materials. Randall’s offers everything from surface prep tools and primers to premium paints and finishes that deliver smooth, consistent results.
Visit your nearest Randall’s location or Contact Usfor personalized recommendations. Explore our Collectionsfor high-quality paints and supplies trusted by professionals across Ottawa.
Small mistakes don’t have to ruin your paint job—Randall’s has the tools, products, and expertise to help you achieve a flawless finish.