Anastasia Beverly Hills - Clear Brow Gel

Conflicting info: under the pic, it says, "size: 0.28 oz ..." under the product description, it says, "size: 2.5ml/0.085 fl. oz." what's the size?

Is this a replica or 100% authentic?

Will this help keep eyebrow pencil from smudging? Is it water proof?

Do you use this before you apply your eyebrow color