deep colour issue

In the context of painting and coatings, particularly in Australia, the term "deep colour issue" refers to the challenges and problems associated with using dark or deep-coloured paints (such as deep blues, reds, blacks, and dark greys). 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 require multiple coats to achieve full coverage, especially over lighter substrates. This is due to the lower hiding power of some deep pigments.

2. Burnishing
   Dark colours are more prone to showing marks, scuffs, and shiny patches when rubbed or cleaned, especially in low-sheen or flat finishes.

3. Fading / UV Degradation
   Deep colours, particularly reds and blues, can fade more quickly when exposed to sunlight due to the breakdown of pigments under UV radiation.

4. Heat Retention
   Dark colours absorb more heat, which can lead to surface expansion and contraction, potentially causing paint failure (e.g., cracking, peeling) on exterior surfaces.

5. Efflorescence Visibility
   On masonry or rendered surfaces, white salt deposits (efflorescence) are more visible against dark colours, affecting aesthetics.

6. Colour Matching Difficulties
   Touch-ups or repairs can be difficult to match perfectly due to the richness and depth of the original colour.

7. Sheen Variations
   Uneven application or touch-ups can result in noticeable sheen differences, especially in low-sheen or matte finishes.

Best Practices to Mitigate Deep Colour Issues:

• Use a tinted undercoat or primer to improve coverage.
• Choose high-quality paints with UV-resistant pigments.
• Apply the paint in even, consistent coats.
• Use appropriate sheen levels for the surface and traffic conditions.
• Consider cool colour technology paints for exteriors to reduce heat absorption.

In summary, a "deep colour issue" refers to the specific technical and aesthetic challenges that arise when working with dark-coloured paints, and it requires careful product selection and application techniques to ensure a durable and attractive finish.