The ST-821 20° Matte Topcoat is part of Stardust® Variance Range, and is the second most Matt Clear Coat, just before the ST820 40° Semi-Matt Clear Coat and after the ST-822 4° Extreme Matte Clear Coat.
Gloss grades: 20°
Excellent hardness: 3H hardness scale (UN 78267:199) Perfect resistance to bad weather, UVs, petrol, alcohols
This is an extra hard clear coat originally designed for automotive and motorcycle body, providing robustness and resistance to aggressive factors such as abrasion, washing, scratching, weather, fuel. It is however widely used by furniture manufacturers for indoor and outdoor spaces (furniture, kitchens, wood floors, swimming pools, etc.)
ST821 Matte Topcoat innovations:
Matt Topcoats usually demonstrate a degree of fragility to scratches, cleaning, traces of products, and shocks. The Stardust® Variance Mat range uses new nano-technologies to combine matte effect and extreme hardness. The quality of the Stardust® French-made Matte Clear Coats matches that of the best matte topcoats from the world's biggest brands. It constitutes a notable advance in the field of automotive coatings.
Matt aspect 20° The ST-821 Matte Topcoat is not glossy and doesn't reflect the light. It creates a smooth and neutral surface while keeping a perfect transparency. It does not produce a whitish effect, when a thin coat is applied(20-25µm), and thus does not alter the colours and background shades.
Matte Topcoat for all substrates The product can be applied on all paints and topcoats, but also directly on metals and plastics thanks to its exceptional adhesion properties.
Details of the ST821 Kit Offer:
Complete kit including Topcoat (1L), Hardener (0.2L) and Thinner (0.15L) Yield: 10m²/L per coat
How to mix it? Shake the topcoat container. Polyurethane. It's recommended to mix a hardener with the topcoat and add thinner to modify the liquidity of topcoat:
For 100 parts of ST-821 Matte Topcoat: Weigh 20 parts of 9156 Hardener Weigh 10 parts of PU Acrylic Thinner Leave the mixture for 5 min before applying Useful life once mixed: 4h
Spray gun 1.0 - 1.5mm Roller Apply 1-2 thin passes (120g/m²) The Matte Topcoat dries extremely fast and successive passes can be applied without waiting interval between each coat. The matte effect appears during the drying process.
Drying at 20 °C: - Dry to the touch: 30min - Through-drying: 4h - Overcoating: 5h
Density: 0.92kg/L VOC: 40%
Quality Tests for ST-821 Matte Topcoat:
Adhesion Tests (according to ISO-2409/1996): Passed Cold-Check Test (according to UN-48205): Passed Moisture (according to DIN-50017): Passed UVs (according to ISO-11341) Passed, no colour change was noted Pencil Hardness Test (according to UN 78267:1996): 3H Chemical Resistance (according to ISO-2811): no changes were noted according to 5 tests.