Term: topcoats

In painting and coatings, "topcoats" refer to the final layer(s) of paint or finish applied to a surface after the primer and any undercoats. The primary purpose of a topcoat is to provide durability, protection, and the desired aesthetic finish, such as colour, sheen, and texture.

Topcoats are formulated to withstand environmental factors like UV exposure, moisture, abrasion, and chemical contact, depending on the application (e.g., interior, exterior, industrial, or decorative). In both residential and commercial painting projects in Australia, common types of topcoats include:

• Acrylic topcoats – water-based, low-VOC, and suitable for most interior and exterior surfaces.
• Enamel topcoats – oil-based or water-based, offering a hard, durable finish ideal for trim, doors, and high-traffic areas.
• Two-pack (2K) topcoats – used in industrial or commercial settings, offering superior chemical and abrasion resistance.

In summary, the topcoat is the final protective and decorative layer that completes a painting system.