We tend to put our hair through a lot, which is where the K18 Leave-In Molecular Repair Mask comes into play. This no-rinse hair treatment, made with a patented bioactive peptide, promises to reverse damage caused by colouring, heat and styling. Think of it as an apology note to your frazzled, stressed-out hair - one that works by repairing the keratin within each strand.
You can expect stronger, softer and more manageable hair as that damage is repaired. If your hair is porous, crunchy, over-processed and generally past its best, you’ll want to know about this mask.
Why will I love the leave-in K18 Repair Mask?
- Damage-reversing treatment for compromised hair
- Works in 4 minutes
- Treats damage from styling, colouring and lightening
- Patented bioactive peptides
- Repairs keratin within the hair
- Do not rinse out
- Softens, smooths and detangles
- 50ml
How should I use the K18 Leave-in Molecular Repair Mask?
In short, not like a normal hair treatment. This mask has been formulated to work without being rinsed out. First, wash your hair as normal, then towel dry gently but thoroughly. Then, dispense one pump of the K18 treatment into your hand and work through your hair evenly from root to tip. If you have short, fine hair, this may well be more than enough, but longer, thicker hair will need more. Work one pump at a time to avoid overloading your hair, and make sure you’re applying evenly.
Let the treatment sit for four minutes then continue directly to your styling products - do not rinse.
What else do you need to know about the K18 Leave-in Molecular Repair Mask?
When you first get this treatment, you’ll want to use it four washes in a row, but after that, every four to six washes is the way to go.
If you’re a regular dry shampoo user, or otherwise likely to have a bit of product buildup in your hair, it’s best to use a clarifying shampoo or scalp scrub before going in with this treatment.
It’s important not to condition your hair before using this mask, and also not to use too much and overload your hair.
This treatment is also available in a small 5ml size, ideal for travel or trying it out. This listing is for the full 50ml size.
Shipping and Delivery Policy
General Dispatch Information
Celcius Beauty is an Australian-owned and operated online retailer. All orders are fulfilled locally within Australia and shipped to customers nationwide using trusted delivery partners.
Celcius Beauty remains responsible for all customer support, order enquiries, delivery updates, and returns in accordance with our Shipping and Returns Policies.
Orders are dispatched from Australian warehouses.
Orders are processed and dispatched on business days only (Tuesday to Friday), excluding weekends and public holidays.
Once your order has been dispatched, you will receive a confirmation email with tracking details where available.
Australian Shipping Options
Standard Shipping (Australia-wide)
Orders over $60: Free standard shipping on eligible orders (delivery 1–10 business days after dispatch)
Orders under $60: $9.99 flat rate shipping fee (delivery 1–10 business days after dispatch)
Handling Time
Orders are dispatched within 1–4 business days. Handling time applies to dispatch only and does not include delivery transit time.
Delivery times may vary depending on your location, carrier performance, and peak delivery periods.
Delivery Method & Safe Drop
All parcels are shipped using tracked delivery services via Australia Post, Direct Freight, Couriers Please, or StarTrack.
Safe drop may be enabled where available. If safe drop is not suitable, the parcel may be redirected to the nearest post office or collection point.
Delivery decisions are made at the carrier’s discretion.
Oversized & Special Items
Oversized items (such as tanning equipment) may:
Require additional handling time
Arrive separately from the remainder of your order
Lost, Missing, or Delayed Parcels
If your order has not arrived within a reasonable timeframe after dispatch, please contact us at info@celcius.com.au
. Celcius Beauty will work with the carrier to investigate missing or delayed parcels in accordance with Australian Consumer Law.
Responsibility After Delivery
Once an order has been confirmed as delivered to the address provided at checkout, responsibility transfers in line with carrier confirmation, subject to your rights under Australian Consumer Law.
Address Accuracy
Customers are responsible for ensuring all delivery details are correct at checkout.
Returns & Consumer Rights
Returns are accepted in accordance with Australian Consumer Law.
Faulty, damaged, or incorrectly supplied items are eligible for repair, replacement, or refund as required by law.
Change-of-mind returns are eligible for store credit only, subject to conditions outlined in our Returns Policy.
Shipping fees are non-refundable unless required by law.