Choi developed the topcoat after a lot of experimentation — on both her lab technicians and her clients. "I ask for my clients' feedback on everything I produce," she says.
The final product is a combination of what her clients wanted and what her technicians recommended. "My technicians preferred a topcoat that doesn't get thick easily, since they use it repeatedly throughout the day, and my clients generally preferred one that dries quickly, since they don't have the time to wait."
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