What is the best approach for sanding and preparing existing painted surfaces?

The best approach for sanding and preparing existing painted surfaces involves using both fingers and a scuff pad. This method allows for greater control and precision when working on detailed or intricate areas of the surface. The use of fingers provides a tactile feedback mechanism that helps in feeling the surface's contours and identifying any imperfections that may need more attention.

A scuff pad is effective for dulling the existing paint without removing it entirely, creating a better surface profile for the new paint applications. This combination ensures thorough preparation, helping to create a good bond between the existing paint and any new layers that will be applied.

Using only a sanding block or relying solely on a power sander can lead to uneven surfaces or accidental damage to the surrounding areas. Wet sandpaper is typically used for specific applications, such as polishing, and may not be the best choice when preparing a painted surface for repainting. Thus, the combination of fingers and a scuff pad offers the most practical and effective approach to achieve optimal results.