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ST820 40° Semi-Matte Automotive Topcoat

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Semi-Matte Effect Topcoat Kit 1.35L or 6.5L
40° Gloss

The ST820 Clear Coat from the Stardust® Variance Mat range is a good compromise halfway between total matte and gloss for those who are looking for a MAT effect without losing the iridescent effect of modern bodywork paints.

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Transparent semi-matte finish with 40° gloss

Semi-matt two-component topcoat for bodywork. Professional-quality product, with anti-yellowing properties.

Gamme Vernis Mat Stardust®

The ST-820 Semi-Matte Clear Coat is suitable for car, motorcycle, scooter and bicycle bodywork. Stardust's Topcoats benefit from the latest chemical innovations in resins, giving them exceptional hardness and resistance. This product has been tested and is recognized in many European countries for 10 years, and produces a very beautiful semi-matte effect.

Variance Mat Range

The ST-820 Semi-Matte Topcoat has a minimum gloss level (40°), but offers sufficient gloss, just enough not to hide the metallic or pearl effect paints. It allows to preserve the pearl and metallic effects, which disappear with too matte topcoats.

Therefore, it is a good compromise between matte and gloss finish, for those who are looking for a MAT effect without losing the iridescent effect of modern bodywork paints.
It's less matte than our matte and extreme matte clear coats, but provides more gloss than our satin topcoat.

Our Semi-Matte Topcoat is one of the 4 Stardust® Matte Topcoats
ST-819 SATIN (60°), ST-820 SEMI-MATTE (40°), ST821 MATTE (20°), ST822 EXTREME MATTE (4°)

4 degres de mat brillant Stardust®

Very high hardness: 3H
It is also possible to apply the product on plastics and metals.
Very high resistance to chemicals and abrasion, great stretchability and quick drying

Complete kits including varnish (1L or 5L), hardener H423 (0.2L or 1L) and thinner (0.15L or 0.5L)
Yield 10m² / L


Shake well for 30 seconds.
Add 20% of H423 Hardener by weight
Add 10% of PU Acrylic Thinner
Leave the mixture to stand 5 min before application
Mixture useful life: 4h


Spray gun 1.0 - 1.5mm
Apply 1-2 thin passes.
Avoid making thick passes.
The matt appearance can be observed after the semi-matte clear coat has dried.

Drying at 20 °C:
- Dry to the touch: 30min
- Through-drying: 4h
- Overcoating: 5h

Matte varnishes dry quickly.

When painting large parts, it is recommended to reduce the drying speed in order to avoid "seam" or "dusting" defects, thanks to Extra Slow Thinner 708.

Technical specifications:
Density: 0.92kg/L
VOC: 40%

Stardust® Matt Topcoats have undergone numerous extensive tests for mechanical resistance, chemical resistance etc.

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.


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