What should be done before applying a second coat of paint?

Before applying a second coat of paint, it is essential to allow the first coat to dry completely. This step is critical for several reasons.

Firstly, if the first coat is not fully dried, applying a second coat can trap moisture beneath the surface, which can lead to issues such as blistering or peeling paint. Proper drying ensures adhesion, allowing the second coat to bond effectively with the first coat, leading to a more durable and visually appealing finish.

Moreover, waiting for the paint to dry properly helps in achieving an even color and consistency across the surface, as applying a second coat over a still-drying layer can also alter the color and finish, resulting in an uneven appearance.

While sanding the first coat can be beneficial for creating a smoother surface and improving adhesion, this step is not always necessary and is typically done based on the condition of the first coat. Mixing the paint again is useful if some separation has occurred, but it is not directly related to the timing of applying a second coat. Cleaning the brushes is a good practice for maintaining tools, but it does not influence the drying process of the paint itself.

Thus, ensuring that the first coat is completely dry is the most crucial factor to consider before proceeding with a second application.