J is the curl most ranges understock and most technicians misapply. Who it suits, where it fails, and how B sits one step above it.

A set lasts six to eight weeks, but individual extensions do not. How the natural lash cycle, the adhesive bond and client habits run three different clocks.

What to buy before your first set: practice lashes, training heads with a weighted base, and the small tools that keep a practice routine productive.

How to spec and stock a lash workstation: the tile, glue rings, fixing tape, eye pads, adhesive storage and gasket pads, plus the checks that matter.

What a lash sealant coating does to a bond, where it helps without overpromising, how it pairs with adhesive and remover, and how to stock it.

What a lash conditioner does, why oil content decides retention for extension clients, and how to source, label and stock it in a salon range.

What a lash growth serum is, the ingredient families buyers check, where the cosmetic claims line falls in the US and EU, and how a private-label order runs.

The three products sold as a lash kit, the tools worth paying for, the consumables that complete a starter pack and the refill list that should follow it.

How light-cured lash adhesive works with a UV LED lamp, what the technician controls, what to verify in the pair and what a UV range needs on the shelf.

The four products sold as a lash brush, what makes a spoolie or cleaning brush usable, hygiene and material claims, and how to buy them in bulk.