How to Fix Cracks, Peeling Paint and Damp Stains Before Painting

Before painting any wall or ceiling, proper preparation is essential. Cracks, peeling paint and damp stains are three of the most common problems homeowners face, and if they aren’t repaired correctly, they can ruin the final finish and cause the same issues to return.

At JUSTHIRE, we make it easy to book professional painting services online. Enter your postcode, upload photos and get a free fixed-price quote instantly with no site visit needed.

Here’s how to address the most common wall and ceiling issues before painting, so you can achieve a smooth, long lasting finish.

Why Fixing These Problems Matters

Painting over defects may look fine for a few weeks, but the underlying issues will eventually show through. Proper preparation ensures:

• A clean, smooth paint finish

• Longer lasting results

• No flaking or bubbling

• Better adhesion for new paint

• Protection against future damage

How to Fix Cracks in Walls and Ceilings

Cracks can be caused by movement, settling, temperature changes or poor previous repair work.

1. Open up the crack slightly

Use a scraper to widen the crack. This helps the filler bond more effectively.

2. Brush out dust and loose material

Ensure the area is clean and dry.

3. Apply filler or joint compound

Choose a flexible filler designed for interior walls. Smooth it with a filling knife.

4. Sand once dry

Use fine sandpaper to achieve a flush, smooth finish.

5. Prime the repaired area

Prevents flashing and ensures consistent paint absorption.

How to Fix Peeling or Flaking Paint

Peeling paint usually happens due to moisture, poor surface prep or low quality previous paint.

1. Scrape away all loose paint

Use a paint scraper until only solid, well bonded paint remains.

2. Sand the edges

Feather the edges so the surface transitions smoothly.

3. Clean the surface

Remove dust, dirt or grease using sugar soap or a mild detergent.

4. Apply a primer

This helps seal the surface and improves adhesion for the topcoat.

5. Fill uneven areas if needed

Sand again before painting for a flat, consistent finish.

How to Treat Damp Stains Before Painting

Damp is the most important issue to fix correctly. Painting over damp will cause immediate bleeding, discolouration and ongoing mould problems.

1. Identify the source of the damp

This could be a leak, condensation, exterior wall moisture, plumbing issue or poor ventilation. Solve the root cause first.

2. Allow the area to dry completely

Use ventilation, heating or a dehumidifier if needed.

3. Clean any mould or mildew

Use a mould treatment designed for walls and ceilings.

4. Apply stain block or damp seal primer

This prevents the stain from bleeding through fresh paint.

5. Once dry, paint as normal

Use high quality paint for longer lasting protection.

When You Should Call a Professional

Some repairs are simple to DIY, but you should consider hiring a professional if:

• The cracks keep returning

• The peeling is widespread

• The damp source is unknown

• The ceiling is high or hard to access

• You want a flawless, premium finish

A professional decorator can diagnose issues quickly and ensure the surface is prepared to a high standard.

Why Choose JUSTHIRE for Painting and Repairs

At JUSTHIRE, we connect you with trusted local decorators who can repair and paint walls and ceilings to a professional standard.

You get:

• Trained and insured decorators

• Fixed price quotes online

• Fast, reliable service

• High quality preparation and finish

• No site visit needed

Book Your Wall and Ceiling Painting Online Today

Whether your walls need simple crack repairs or full surface preparation, JUSTHIRE makes it easy to get a trusted professional to handle the job.

👉 Enter your postcode and get your free online painting quote today.