Professional Molecular Repair Mask

Professional Molecular Repair Mask is rated 4.7 out of 5 by 491.
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What It Is

Made to be used as part of the K18 PRO service (K18 PRO Mist + K18 PRO Mask)

 

This leave-in treatment mask does cleanup duty after damage caused during bleaching, chemical services, and heat. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes.

 

A retail-sized version of the K18 Mask helps to maintain your client's hair strength and elasticity in between salon appointments. This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach, color, chemical services & heat—restoring strength, softness, smoothness, and bounce to hair.

What It Does

• The K18PEPTIDE™ works at the innermost layer of hair, reconnecting polypeptide chains and disulfide bonds broken during bleaching, chemical services, and through heat damage. By addressing these damage sites at the innermost layer of hair, core strength and elasticity are renewed for strong, smooth, bouncy hair—even after the most extreme damage done in the salon.

• Damage is ongoing - Send the K18 retail sizes home with your client to keep hair health going, make services last longer, and maintain hair health in between appointments + the K18 PRO service.

What Else You Need to Know

• Powered by the patented K18PEPTIDE™, engineered over 10 years in a biotech lab to work on the molecular level to rebuild hair from the inside out in just 4 minutes.

• Because the K18PEPTIDE™ works at the molecular level, it works on every single hair type

• Clinically proven to reverse hair damage from: Bleach + Color, Chemical Services, Heat

• Restores strength, softness, smoothness, and bounce

• Immediate + progressive results

• Vegan, color-safe, cruelty-free

 

With just one salon treatment using the K18 PRO Service (PRO mist + PRO mask), hair is restored up to:

• 91% original strength*

• 94% original elasticity*

 

*Results observed in a clinical study while using mist and mask as part of a bleaching treatment. Results may vary depending on hair type, quality, and history.

For at home use / or salon use without a chemical service:

1 - Shampoo, do not condition.

2 - Towel-dry thoroughly.

• 15ml size mask = Begin with 3 pumps of K18 leave-in molecular repair hair mask, only add more as needed depending on length, thickness, and condition. Apply all over, one pump at a time, maximum dosage is 9 pumps.

• 50 + 150ml size mask = Begin with 1 pump of K18 leave-in molecular repair hair mask, only add more as needed depending on length, thickness, and condition. Apply all over, one pump at a time, maximum dosage is 3 pumps.

3 - Let sit for 4 minutes. Do not rinse out.

4 - Then comb, add product + style as usual.

5 - Use for the first 4-6 washes, then as needed.

 

How to use with a chemical service:

1 - Prior to your service, mist hair with water (do not saturate).

2 - Section dry hair into 4 quadrants

3 - Apply K18 PRO mist per quadrant based on length and density

4 - Let sit for 4 minutes. Do not rinse out.

5 - Dry hair if needed, then perform desired chemical service.

6 - Shampoo, do not condition.

7 - Towel-dry thoroughly.

8 - Apply K18 PRO mask and add more as needed depending on length, thickness, and condition. Work evenly into hair from ends to roots, one pump at a time.

9 - Let sit for 4 minutes to activate. Do not rinse out.

10 - Then comb, add product + style as usual.

 

*Refer to the K18 service guide pdf for specific usage and dosage instructions by chemical service.

Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20,sh-Oligopeptide-78 (K18Peptide™), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

Purchases made in SalonCentric stores may be returned to any SalonCentric store. Purchases made through SalonCentric Customer Service, SalonCentric Business Partners, and SalonCentric.com orders Sold and Shipped by SalonCentric may be returned to a SalonCentric store; however, the return must not exceed $450 and must include the original receipt, packing slip, or invoice. For returns in-store of online orders, the refund will be credited back to the original payment method once the return has been processed. For SalonCentric.com Online Exclusive orders sold and shipped by third-party sellers, please see more details linked below for return steps.

The SalonCentric return policy does not currently apply to Kérastase & Shu Uemura purchases. Kérastase & Shu Uemura do not accept returns.

Click to see more details.

Rated 5 out of 5 by from K18 Amazingggg. It’s a staple recommendation. Noticeable results immediately and leaves my hair and clients hair feeling so soft, hydrated.
Date published: 2025-08-18
Rated 5 out of 5 by from amazing Love how this makes my clients hair feel, a little goes a long way.
Date published: 2025-08-18
Rated 5 out of 5 by from Amazing The best !!! This product is amazing Totally repairs the hair from the inside out
Date published: 2025-08-12
Rated 5 out of 5 by from Worth it Had to see what the hype was about with this conditioner. After using for a few weeks, i can feel the difference with the hydrating in my hair. No more dry ends. Will definitely be picking up a full bottle
Date published: 2025-08-11
Rated 5 out of 5 by from the best!! completely saved my hair and i recommend this to everyone!!
Date published: 2025-08-06
Rated 5 out of 5 by from best hair mask ! its been a month and half since I have been using this mask and I love it ! My hair looks so much healthier now
Date published: 2025-08-05
Rated 5 out of 5 by from YES! This mask has saved my blonde hair! I recommend it to anyone who has heavily processed hair.
Date published: 2025-08-01
Rated 5 out of 5 by from Highly recommend! Obsessed with this product. I have tried almost everything on the market & nothing works like this product does. I feel a noticeable difference in my hair & clients hair when I use it.
Date published: 2025-07-29
Rated 5 out of 5 by from 10/10 Very noticeable results. My hair feels so smooth and healthy after. 10/10. Also smells great.
Date published: 2025-07-19
Rated 5 out of 5 by from My hair feels so much stronger! I absolutely love this mask! It makes a huge difference in the strength of my hair. I have very dry hair so I use a leave in spray/conditioner after I’ve let it sit and combed through it because it is so lightweight that doesn’t tame my frizzy waves down enough for me by itself.
Date published: 2025-07-06
Rated 5 out of 5 by from Awesome for damaged or previously lightened hair. My favorite for when you need to tone down those frizzy ends when air drying.
Date published: 2025-06-30
Rated 5 out of 5 by from changed my hairs life Ever since I started using this a couple years ago, I have noticed the biggest difference in my hair. It is stronger, shinier, brighter, and even lighter?? If that makes sense. This has added the life to my thin, fine hair that I needed. Do not use if you want full of life hair.
Date published: 2025-06-24
Rated 5 out of 5 by from K18!! Love this product I used it on my hair at first now my clients saw a difference after a couple using you don’t need that much product worth the monies
Date published: 2025-06-20
Rated 5 out of 5 by from HOLY GRAIL By far my favorite mask, leaves my own hair and my clients hair feeling so good
Date published: 2025-06-19
Rated 5 out of 5 by from 4 min mask Revives hair in just 4 min. Shampoo leave on for 4 min. Partially rinse and style! Works every time. Hair is unbelievably shinny, sleek and so smooth
Date published: 2025-06-17
Rated 5 out of 5 by from Great product [Employee of saloncentric] Great mask! What a difference on my curls and my damaged hair.
Date published: 2025-06-11
Rated 5 out of 5 by from perf This mask is saving my curls from previous damage!
Date published: 2025-06-04
Rated 5 out of 5 by from Liquid Gold The best!! I can’t recommend K-18 enough. after extreme bleach damage this has brought my hair back to life!
Date published: 2025-06-02
Rated 5 out of 5 by from Saved my sister’s hair Love this product! I first tried the mini, but it was so good I had to buy the big bottle!
Date published: 2025-06-01
Rated 5 out of 5 by from amazing! This is the best repair mask I’ve ever used on my hair!
Date published: 2025-05-29
Rated 5 out of 5 by from Buy it This product truly does soften the ends of your hair! Breakage is not an issue after religiously using this.
Date published: 2025-05-27
Rated 5 out of 5 by from I was crying Amazing, saved my hair. I had some unexpected issues with a perm... And ended up having to chop 8 inches. This mask saved the rest of my hair so I didn't have to shave my head. I was fearful.
Date published: 2025-05-27
Rated 5 out of 5 by from great product Easy to work through the hair! Makes the hair feel soft and healthy and you can tone right over top of this
Date published: 2025-05-04
Rated 5 out of 5 by from Best hair product out there!! This is the best thing ever for damaged hair!!!! Highly recommend!!! My hair has never felt healthier. Worth the cost!!!
Date published: 2025-05-02
Rated 5 out of 5 by from The best I can honestly say this is the best bond building treatment I’ve ever used! It truly does protect and repair the hair. Personally, my hair had started breaking and wouldn’t grow past my shoulders since moving to my new home (which had horrible well water). I had a water filtration system and softener installed, but the K18 is what has brought my hair back to life; now it is noticeably thicker and way longer & healthy. I love it!
Date published: 2025-04-29
Rated 5 out of 5 by from Actually repairing!!! Love love love this product right now!!! Have used 3 times, 4 washes apart and it has truly transformed my over processed hair.
Date published: 2025-04-18
Rated 5 out of 5 by from Will blow your mind This treatment will blow your mind on how well it rebuilds the hair bonds. Make sure to not over use it and really work it in your hands until it turns thick and white.
Date published: 2025-04-08
Rated 5 out of 5 by from Absolute An absolute Favorite! Amazing results and Love the scent!
Date published: 2025-04-03
Rated 5 out of 5 by from Weightless leave in repair Just a pump or two restores texture in waves and curls, conditions without weight and helps support fragile, processed hair. I really appreciate that it's not full of gunky silicone fillers like some other brands
Date published: 2025-04-01
Rated 5 out of 5 by from unbelievable difference Unbelievable difference in just 1 use. I can’t believe how the health of the hair has improved.
Date published: 2025-03-30
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