Water-based paints require a primer. The primer is the first layer in the paint system, and its main functions include:
Improving topcoat adhesion: The primer enhances the adhesion between the water-based topcoat and the substrate, ensuring a stronger coating.
Providing alkali resistance: The primer neutralizes alkaline substances in the substrate, preventing problems such as whitening and peeling of the topcoat due to excessive alkalinity in the substrate.
Ensuring even topcoat absorption: The primer makes the substrate smoother, which helps the topcoat absorb evenly, resulting in optimal coating results.
Saving resources: Using a primer makes the topcoat appear fuller, reducing the amount of topcoat needed and thus saving resources.
Therefore, when using water-based paints, it is recommended to follow the standard procedure of applying the primer first, then the topcoat, to ensure coating quality and effect.
