Why Finish Matters More on Relief
On a flat surface, a finish is simply a colour. On a three-dimensional relief panel, the finish becomes a lighting instrument. The interaction between surface coating, relief depth, and ambient light creates shadow gradients, highlight ridges, and tonal depth that change throughout the day. A matte white panel with 30 mm relief will read completely differently from the same geometry in a semi-gloss bronze — not because the form has changed, but because light interacts with the finish in fundamentally different ways.
This means the finish specification is not an afterthought. It is a design decision that shapes how the geometry is perceived, and it should be considered alongside the pattern selection, not after it.
| Finish Type | Description | Suitable For | Lead Time Impact |
|---|---|---|---|
| Standard Paint | Spray-applied acrylic or mineral paint system. Any RAL or NCS reference. Matte, satin, or semi-gloss sheen levels. | General interiors, hotel corridors, lobby feature walls, ceiling panels | Included in standard lead time |
| Real metal particles (bronze, brass, copper, iron) bound in a resin matrix and hand-applied to the panel surface. Can be polished, patinated, or aged to specification. | Feature walls, reception desks, elevator lobbies, premium hospitality | +5–7 days for hand-finishing | |
| Textured Coating | Multi-layer coating systems that add tactile surface texture — stone grain, concrete effect, oxidised metal. Applied over the base relief geometry. | Restaurants, spa areas, cultural venues, retail feature installations | +3–5 days for layered application |
| Custom / Multi-Tone | Bespoke colour development, gradient effects, two-tone treatments, or physical sample matching. Colour-matched against a provided swatch, Pantone, or physical object. | Brand-specific installations, art commissions, designer collaborations | +5–10 days including colour approval cycle |
How Relief Depth Interacts with Finish
Shallow relief (5–15 mm) produces subtle shadow play. Light finishes in matte sheen emphasise the geometry through soft gradients. Dark finishes on shallow relief can flatten the perceived depth — the shadows disappear into the base colour.
Deep relief (25–50 mm) creates dramatic contrasts regardless of colour. However, sheen level becomes critical: a high-gloss finish on deep relief generates hard specular highlights that can overwhelm the pattern. A matte or satin finish on the same geometry allows the eye to read the full three-dimensional form. For most architectural applications, matte to low satin produces the most controlled result.
When specifying colour for relief panels, always reference a physical sample rather than a screen rendering. The same RAL colour will read 2–3 shades darker in the recessed areas of a deep relief panel due to shadow accumulation. We recommend approving colour on a finished relief sample, not a flat colour chip.
Material-Specific Considerations
✓ Mineral silicate paint
✓ Cold-cast metal finishes
✓ Textured coatings
● Epoxy — test adhesion first
✓ Ceramic-smooth base surface
✓ Acrylic paint systems
✓ Cold-cast metal finishes
✓ Textured coatings
✓ UV-stable exterior coatings
✓ Gel-coat factory finish
PMAG accepts virtually all interior paint systems. The ceramic-smooth surface produced by alpha gypsum casting provides an excellent bonding substrate without the need for heavy priming. For standard RAL colours, a single primer coat followed by two topcoats is sufficient. Cold-cast metal finishes bond directly to the gypsum surface.
PUCOMP is finished in the mould or immediately post-demoulding. For exterior applications, a UV-stable 2K polyurethane system is standard. For interior applications, the same acrylic systems used on PMAG are compatible. The polyurethane substrate is non-porous, so adhesion-promoting primers are used where required.
Colour Matching Process
For projects requiring a specific brand colour, heritage match, or bespoke tone, we offer a full colour development service. The process begins with a reference — a RAL/NCS code, Pantone swatch, physical material sample, or even a photograph. From this reference, we develop a test coating applied to a relief sample section, which is shipped to the design team for approval under the intended lighting conditions.
Colour approval typically requires one iteration for standard references and two for complex matches (metallic, pearlescent, or gradient effects). The approval sample becomes the contractual colour standard for the production run.
What to Include in Your Specification
A complete finish specification for relief panels should include the colour reference (RAL, NCS, Pantone, or "match to approved sample"), the sheen level (matte, satin, semi-gloss, or gloss), the finish type (standard paint, cold-cast metal, textured, or custom), and any performance requirements specific to the environment — such as washability for food service areas or UV resistance for sun-exposed interiors.
For cold-cast metal finishes, specify the base metal (bronze, brass, copper, iron) and the desired surface treatment (polished, brushed, patinated, or naturally aged). Patina finishes are applied in the workshop and sealed — they will not continue to oxidise on site.