What Is the Clearcoat Property in Blender?

The clearcoat property in Blender’s Principled BSDF shader is used to simulate a thin, transparent gloss layer on top of a base material. It creates realistic reflective coatings commonly seen on automotive paint, lacquered wood, cell phone screens, and glazed ceramics without the need to build complex custom node setups.

How Clearcoat Works

In the real world, many objects consist of a base material covered by a protective or aesthetic clear layer. For example, car paint has a base color layer followed by a clear protective varnish.

Blender replicates this physical behavior by adding a secondary specular highlight layer over the primary material defined in the Principled BSDF node. The base layer beneath the clearcoat can have its own roughness, metallicness, or bump maps, while the clearcoat sits smoothly on top, reflecting light independently.

Key Clearcoat Settings

Blender provides specific parameters within the Principled BSDF node to fine-tune the appearance of the clearcoat:

  • Clearcoat (Weight): Controls the overall intensity and visibility of the clearcoat layer. A value of 0.0 disables the effect entirely, while 1.0 gives maximum reflection strength.
  • Clearcoat Roughness: Sets the micro-surface roughness of the clear coat itself. Lower values (near 0.0) produce sharp, mirror-like reflections, while higher values create a satin or semi-gloss finish. This is independent of the base layer's roughness.
  • Clearcoat Normal: Allows you to plug in a separate normal map specifically for the clearcoat layer. This is useful for creating effects like scratches, dust, or ripples on the top coating while leaving the underlying base material unaffected.

Common Use Cases

Clearcoat is ideal for materials that feature a distinct two-layer look:

  • Car Paint: Simulates the glossy clear varnish over metallic or matte base coat flakes.
  • Lacquered and Polished Wood: Adds a smooth outer sheen over rougher, textured wood grain.
  • Carbon Fiber: Creates a smooth resin layer over the woven texture beneath.
  • Glazed Ceramics: Gives pottery a glass-like finish over porous clay or painted patterns.
  • Wet Surfaces: Simulates a thin film of water coating an object, such as wet asphalt or rain-slicked skin.

Advantages of Using Clearcoat

Before the introduction of the clearcoat property in the Principled BSDF node, achieving this effect required mixing a Diffuse or Glossy BSDF with a separate Glossy BSDF using a Layer Weight or Fresnel node.

Using the built-in clearcoat property streamlines your node tree, improves render efficiency, and ensures physically accurate Fresnel reflections automatically.