Essence Fix & Last 18H Make-Up Fixing Spray is formulated to enhance the longevity of makeup applications through a systematic interaction of its active ingredients and solvent-based delivery system. The primary components of this formulation include water (aqua), denatured alcohol, and various polymers, which collectively operate to stabilize cosmetic products on the skin surface. Water serves as the solvent, facilitating the dissolution and uniform dispersion of other constituents. Denatured alcohol functions as a volatile solvent that aids in rapid evaporation after application, creating a lightweight film that adheres makeup to the skin. Its volatility also contributes to a low viscosity to ensure easy application. Additionally, the presence of alcohol may enhance the absorption of subsequent layers of makeup due to its dehydrating effect, leading to a tighter film formation upon evaporation. The fixing capability of this spray is further attributed to film-forming agents such as polyvinylpyrrolidone (PVP) and/or acrylates copolymer. These polymers create a matrix-like structure upon drying, effectively entrapping makeup particles and preventing their migration due to environmental factors such as humidity and temperature. Studies have shown that such formulations, containing PVP, demonstrate a significant increase in makeup retention over extended periods, with a reported durability of up to 18 hours under controlled conditions. The pH of the formulation typically ranges from 5.5 to 7, aligning with the skin’s natural pH, which minimizes the risk of irritation.