Piur London Rebonding Shampoo (1000 ml) is the preparation wash of the Rebonding straightening protocol: it removes residual build-up and evens out porosity, so Keraplex meets the same fibre from root to ends. It is made for chemically resistant hair booked for the two-product service, stays on for 2 to 3 minutes, and the hair is dried completely before Keraplex goes on. Piur London presents it as formaldehyde-free and V-Label vegan, the same two marks as Keraplex.

Why the wash comes first

Keraplex can only realign hair evenly if it meets an even fibre. This shampoo is built for that one job: Piur London describes its formula as removing residual build-up while equalising porosity across the fibre. That is also its limit. It is not a stand-alone clarifying shampoo, and we would not sell it as one; its place is the start of a Rebonding appointment. What you control is the massage, gentle and without rubbing, and how dry the hair is before the next product touches it.

Key ingredients

• Hypnea musciformis extract: a marine alga extract.
• Sargassum filipendula extract: a second marine alga.
• Gelidiella acerosa extract: the third marine alga Piur London names.
• Cocamidopropyl betaine: a mild secondary cleanser.

What to expect

Before Keraplex the hair feels stripped-clean and a little dry, and it drags slightly between the fingers. That is the preparation doing its job. It is not conditioned away: nothing that coats the fibre goes on between this wash and the smoothing treatment.

Who it is for

• The opening step of every Rebonding service, on every head
• Chemically resistant hair, natural or previously treated, booked for Rebonding
• Hair carrying styling product or silicone that would stop Keraplex taking evenly
• Salons running Keraplex who want the preparation step from the same system

Who it is not for

• Blonde, highlighted or sensitised hair: that hair goes to Reactive Pro, which opens with its own shampoo
• A general or everyday wash: its role is preparing the fibre for Keraplex
• Damaged or broken skin on the scalp
• Home use: it is a professional product, for adult clients

Professional tip

Feel the hair before you dry it. Clean hair squeaks between the fingers and drags slightly; if it slides, it is still coated, and Keraplex will take unevenly on exactly those lengths. Wash again before you reach for the dryer.

How to use

Two ways to work this shampoo: Piur London's directions as the brand publishes them, and the way we run it at the backwash, with the timing left to Method A.

Method A: manufacturer method

1. Apply to damp hair.
2. Massage the scalp and lengths gently, without rubbing.
3. Leave for 2 to 3 minutes.
4. Rinse thoroughly with warm water.
5. Dry the hair completely before moving on to Keraplex.

Method B: the Brazilian method

1. Detangle dry. A wide-tooth comb before the hair goes wet, so the lather reaches every strand. Salon practice, not one of Piur London's steps.
2. Lather the lengths. Styling product, silicone and oil sit on the mid-lengths and ends more than at the scalp, so work the lather there. Pads of the fingers at the scalp, never nails.
3. Leave, then rinse. For the time in Method A, then rinse as Method A says.
4. Wash again if needed. On product-heavy hair, if it still feels coated after the rinse, wash a second time before drying.
5. Nothing in between. No conditioner and no mask between this wash and Keraplex: anything that coats the fibre undoes the preparation.
6. Dry completely, roots first. The root area dries last and is where damp hides. Keraplex goes onto hair carrying no water.

Where it fits in the Piur London range

Rebonding is two products in one order: Rebonding Shampoo, then Rebonding Keraplex, the glyoxylic smoothing treatment that is ironed in. For blonde, highlighted or sensitised hair, Piur London runs the same two-product logic as Reactive Pro, opening with Reactive Pro Shampoo. Both protocols sit in Piur London Professional, under the Piur London brand page.