When is it appropriate to use wet sanding in auto body refinishing?

Wet sanding is commonly used during the finishing process of paint jobs. This technique involves using water as a lubricant while sanding, which helps to minimize dust and prevents the sandpaper from clogging. The primary purpose of wet sanding in the context of auto body refinishing is to achieve a smoother surface before the final polishing stage. By smoothing out imperfections in the paint, such as orange peel or minor scratches, wet sanding prepares the surface for a high-quality finish. This step is essential in ensuring that the gloss and clarity of the paint are maximized after polishing.

In contrast, wet sanding is not typically employed immediately after applying primer as it is too early in the refinishing process for a smooth finish, nor is it appropriate to use before any painting, as it could cause damage to the substrate. Wet sanding after the final coat of paint is also generally avoided, as it can risk compromising the integrity and appearance of the topcoat unless it is specifically meant for that purpose and is carried out carefully.