What potential issue could arise from water coming into contact with drying paint?

When water comes into contact with drying paint, it can lead to the formation of blisters on the paint surface. This occurs because water creates moisture that gets trapped beneath the surface of the paint layer. As the paint dries, the water can expand due to heat or other environmental conditions, causing the paint to lift away from the substrate. This blistering not only affects the aesthetic quality of the paint job but can also compromise the integrity of the finish, leading to peeling or flaking over time. Proper drying conditions and avoiding exposure to moisture during the drying phase are crucial to preventing such issues and ensuring a smooth, durable finish.