Term: deep colour issue

In the context of painting and coatings, particularly in Australia and other regions with similar industry standards, the term "deep colour issue" refers to the challenges and problems associated with using dark or highly saturated paint colours. These issues can affect both the application process and the long-term performance of the paint.

Common Deep Colour Issues:

1. Poor Coverage (Opacity)

   • Deep colours often have lower hiding power, meaning more coats are required to achieve full coverage, especially over light or contrasting substrates.

2. Burnishing

   • Dark colours are more prone to showing shiny patches (burnishing) when rubbed or cleaned, especially in low-sheen or flat finishes.

3. Colour Variability

   • Inconsistent mixing or application can lead to visible colour variation, especially with touch-ups or when using different batches.

4. Fading and UV Degradation

   • Deep colours, particularly those made with organic pigments, are more susceptible to fading under UV exposure, especially on exterior surfaces.

5. Heat Retention

   • Dark colours absorb more heat, which can lead to substrate expansion, paint failure (like blistering or peeling), and increased thermal stress on surfaces.

6. Drying and Curing Issues

   • Some deep colours, especially those with high tint loads, can take longer to dry or cure, potentially affecting recoat times and finish quality.

7. Efflorescence Visibility

   • On masonry or cementitious surfaces, white salt deposits (efflorescence) are more visible against dark colours.

Solutions and Best Practices:

• Use tinted primers to improve coverage.
• Choose high-quality paints with advanced pigment technology.
• Apply multiple thin coats rather than one thick coat.
• Use UV-resistant formulations for exterior applications.
• Follow manufacturer recommendations for drying times and application conditions.
• Consider low-sheen or satin finishes to reduce visible imperfections.

In summary, a "deep colour issue" encompasses the technical and aesthetic challenges that arise when working with dark or richly pigmented paints. Proper surface preparation, product selection, and application techniques are essential to mitigate these issues.