Weathering Topcoat

Definition - What does Weathering Topcoat mean?

A weathering topcoat is a special surface treatment applied on top of the basic paint of a substrate to create a realistic finish. The coating aims to provide an appearance that the product has been in long service or faded in nature. This top paint layer can also protect the underlying paint or coating. It also serves to hide the edges of underlying coats like decals.

Corrosionpedia explains Weathering Topcoat

The illusion created by a weathering topcoat is to make it look worn out and thus create an authentic appearance. It is applied mainly to have the same generic type as the substrate. This means that compatibility and color uniformity can be achieved if the right topcoat can be found. Weathering topcoats have the following properties:

  • Good gloss retention when exposured to sunlight
  • Hydrolytic stability and resistance
  • Good abrasion resistance
  • Corrosion protection

The weathering topcoat is applied after decals, panel linings, gloss paint, flat paint and primer. The outcome of the weathering topcoat depends on the paint job. Since different top coats react differently with the base coat, testing is required to make sure the right topcoat is used. Therefore it is purposely deigned for aesthetic value and durability.

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