Waterproofing typically relies on film-forming agents such as silicone resins, acrylate copolymers, or high-melting-point waxes like carnauba and candelilla. These create a water-resistant film on skin. Solvent-based liquid liners use isododecane or similar carriers that evaporate quickly, leaving a long-wear pigmented film. A qualified cosmetic chemist selects the system based on desired feel, removal ease, and regulatory constraints.
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