Understand Lap Marks and Wet Edge Principle

What happens here

The presenter begins by explaining what lap marks, also known as haloing or hat banding, are: visible lines on a painted wall. He illustrates how these occur when rolling over paint that has already dried. The main cause is failing to maintain a "wet edge" during the painting process. He shows a wall where sections have dried, highlighting how rolling new paint next to a dry section will inevitably result in a visible line.

Goal: Identify common painting flaws and understand the importance of a wet edge.