n-Octyl acetoacetate is primarily used as a coalescing agent and solvent in waterborne paints, coatings, and printing inks. It promotes film formation at lower temperatures, slows drying time, improves flow and leveling for smoother finishes, and is suitable for spray or brush applications. Additionally, it serves as a solvent and coupling agent in cosmetics and personal care products, enhancing texture, spreadability, and skin penetration while providing a mild fruity odor that can contribute to fragrance stability.