Example aspects of a mixture for coating a brush fiber, a cosmetic brush, and a method for manufacturing a coated brush fiber are disclosed. The method for manufacturing a coated brush fiber can comprise idling an uncoated brush fiber in a mixer containing crystal particles; introducing a resin into the mixer; heating and agitating the resin and crystal particles within the mixer to form a mixture; and coating the uncoated brush fiber with the mixture to form a coated brush fiber.