Why is it essential to apply a base coat or primer before tanning?

Applying a base coat or primer before tanning is crucial for achieving an even tan. A base coat prepares the skin by providing a smooth and uniform layer for the tanning solution to adhere to. This process allows the tanning product to develop more consistently across the skin's surface, reducing the chances of streaks or patches that can occur when applying the tanning solution directly on unprepared skin.

Additionally, a primer can help to fill in any imperfections or rough areas on the skin, creating a more flawless appearance once the tan develops. A consistent base ensures that the tanning product can interact evenly with the skin, leading to a more natural-looking tan that lasts longer and fades more evenly.

The other options, while they may have some merit in a broader context of skin care, do not address the primary purpose of using a base coat in tanning processes.