Yes, applying snail mucin on damp skin can be beneficial. Snail mucin, also known as snail secretion filtrate, is a popular ingredient in skincare products due to its hydrating and soothing properties. When applied to damp skin, it can help lock in moisture and enhance its absorption into the skin.

Damp skin allows for better penetration of skincare products as it helps to soften the stratum corneum (the outermost layer of the skin) and increase its permeability. This can help the snail mucin penetrate deeper into the skin, delivering its moisturizing and nourishing benefits more effectively.

Additionally, applying products like snail mucin on damp skin can also help to prevent evaporation of water from the skin's surface, keeping it hydrated for longer periods.

However, it's important to note that individual skin types and preferences may vary. If you find that applying snail mucin on damp skin doesn't work well for you, you can experiment with different application methods to see what works best for your skin.