What is the substrate?

What is the substrate?

• A. Material under paint, e.g., brick, cement, drywall, wood, metal
• B. The color of the paint
• C. The topcoat
• D. The primer

Answer: (A)

In coatings terminology, the substrate is the material underneath the paint—the surface that the coating is applied to. Examples include brick, cement, drywall, wood, or metal. This base material is the part you prep and inspect, not the color you see, nor the layers on top of it. The paint color is just a layer above the substrate, and the primer and topcoat are additional layers applied over the substrate. Knowing what the substrate is helps determine appropriate surface preparation and how the coating will perform, especially in lead inspection scenarios where different materials may require different approaches.

In coatings terminology, the substrate is the material underneath the paint—the surface that the coating is applied to. Examples include brick, cement, drywall, wood, or metal. This base material is the part you prep and inspect, not the color you see, nor the layers on top of it. The paint color is just a layer above the substrate, and the primer and topcoat are additional layers applied over the substrate. Knowing what the substrate is helps determine appropriate surface preparation and how the coating will perform, especially in lead inspection scenarios where different materials may require different approaches.