Why Painting Over Cracks Without Proper Preparation Can Fail

Many homeowners think painting is simply about applying a fresh coat of paint over the wall. But if there are cracks, peeling areas or damaged surfaces, proper preparation is just as important as the paint itself.

1. Cracks Should Be Repaired Before Painting

Visible crack lines should first be checked, opened slightly if necessary, and properly filled with suitable plaster or filler.

Simply brushing paint over a crack may hide it temporarily, but the crack can become visible again after some time.

2. Loose or Peeling Paint Must Be Removed

If the existing paint has poor adhesion, painting directly over it will not solve the problem.

The loose areas should be scraped and prepared before applying the appropriate sealer and finishing coats.

Otherwise, the new paint may peel together with the old layer underneath.

3. Sealer Is Important for Problem Walls

For walls or ceilings with previous peeling, powdery surfaces, stains or other difficult conditions, a suitable sealer can help stabilise the surface before repainting.

For certain problem areas, an oil-based sealer may provide better protection and adhesion than simply applying another coat of emulsion paint.

4. Mould Should Not Just Be Covered With Paint

Painting directly over mould does not remove the underlying problem.

The affected area should be cleaned and treated properly first. Where suitable, anti-mould formulated paint can then be applied after preparation.

It is also important to identify possible moisture, condensation or water-leakage problems because paint alone cannot stop an active water source.

5. Good Painting Is Mostly About Preparation

The finishing coat is what homeowners see, but much of the quality comes from the work done before painting:

• Protecting furniture and flooring
• Scraping loose paint
• Plastering holes and visible crack lines
• Sanding uneven areas
• Applying the correct sealer or undercoat where required
• Allowing sufficient drying time between coats

Proper preparation helps the finished paint look smoother and last longer.

A&J Painting & Handyman

Professional home painting services in Singapore since 2007.

We focus on proper surface preparation, suitable paint systems and transparent pricing.

For applicable painting packages, we also provide an 18-month one-time free rectification / touch-up warranty.

If your ceiling or wall is peeling, mouldy or cracking, it is better to identify the cause before simply repainting it.