From the manufacturer:

Seal liquid eyeliner for smudge-proof eye definition, or mix with eyeshadow to create waterproof designs. For cake eyeliner: Squeeze a few drops directly onto cake eyeliner. Roll brush (00 or 2 round, depending on desired line weight) to load with liquefied eyeliner. Apply. Eyeliner will set to smudge-proof finish when dry. To set eyeshadow: Squeeze a few drops onto a makeup palette. Apply over eyeshadow and let dry.

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