Professional Molecular Repair Mask

Professional Molecular Repair Mask is rated 4.7 out of 5 by 491.
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5 oz.
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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 4 out of 5 by from 2 week review I’ve only been using this product for about two weeks now so I don’t want to rate it the full 5 stars until I’ve finished the bottle. But so far, my hair feels AMAZING using this product. Once I let my hair air dry I notice that the product makes my hair look and feel soft, smooth, and silky! Would absolutely recommend for anyone trying to repair damaged hair!
Date published: 2026-04-24
Rated 5 out of 5 by from One of the best products I’ve ever bought! I absolutely love K18! I think it is one of the best purchases I have ever made. I swear by it and have seen results and I’ve used it on myself. You do have to make sure though that you listen carefully to the directions and you don’t want to use more than three pumps on hair. This obviously depends on how long your clients hair is. I’ve used 18 for a little over two years now and absolutely love it!
Date published: 2026-04-24
Rated 5 out of 5 by from literally saved my colored hair I regularly color my hair and my ends get really dry, i started using this mask weekly or as needed and i noticed such a big difference! I highly recommend for damaged dry hair!
Date published: 2026-04-24
Rated 5 out of 5 by from The best K18 will ALWAYS be my go to after completing a chemical service! Not only does it bond the hair but it makes it so soft and it’s not greasy at all! Highly recommend!
Date published: 2026-04-23
Rated 5 out of 5 by from Amazing results Nursed my hair back from health from going red to blonde again. Love this stuff
Date published: 2026-04-23
Rated 4 out of 5 by from I do notice a difference It helped to restore damaged hair. I dont use it on a regular basis just after bleaching for highlights. Not a regular purchase.
Date published: 2026-04-22
Rated 5 out of 5 by from Love K18 K18 mask is the best product for hair repair in the 28 years I have been doing hair. This is the only thing that works. I have been recommended this product for a few years now. With consistent use it works for everyone.
Date published: 2026-04-21
Rated 5 out of 5 by from like olaplex on steroids I can’t say enough about K18. As a colorist, keeping the integrity of my clients hair is always my top priority. Including any K18 product into my routine is like a safety blanket of sorts. Despite the word “mask” in its name this is actually a leave in that is used in place of conditioner. Light weight and amazing on any texture, The repair mask makes hair feel like it has never seen a chemical a day in its life. Well worth the money.
Date published: 2026-04-18
Rated 5 out of 5 by from Prevent damage on bleach and tone clients Great tool in the salon to help minimize damage and to control frizzy ends. Easy and quick to use.
Date published: 2026-03-16
Rated 1 out of 5 by from Doesn’t do anything despite the high price. I don’t see any difference on my hair after using this product.
Date published: 2026-02-26
Rated 5 out of 5 by from Worth the money I could instantly tell my hair felt stronger after one time of using this.
Date published: 2026-02-23
Rated 5 out of 5 by from Great for strengthening hair! As someone who heat styles very often and has very textured hair this is a definitely a must to maintain the hair's integrity and to keep it from breaking off. I like that it is a leave in product as well since it is easy to add into a routine.
Date published: 2026-02-20
Rated 5 out of 5 by from K18 to the rescue Love this hair mask. Helps repair hair from the damage caused by bleaching.
Date published: 2026-02-12
Rated 5 out of 5 by from Gives smoothness and shine while protecting I love this product. I can make dry, snaggly hair feel smooth and healthy with regular use.
Date published: 2026-02-08
Rated 5 out of 5 by from WONDERFUL PRODUCT Absolutely revolutionary to my services, repairs damaged hair like a dream
Date published: 2026-01-03
Rated 5 out of 5 by from K18 This product has truly repaired my dead ends. All you do is put it on your hair after a shower and you can totally tell the difference.
Date published: 2025-12-09
Rated 5 out of 5 by from K18 for the WIN I love this stuff & its super simple to use. If you don't like it you are probably using too much. A tiny amount goes a long way.
Date published: 2025-12-03
Rated 5 out of 5 by from love this I love this product, definitely a must for my hair
Date published: 2025-12-03
Rated 5 out of 5 by from LOVE THIS PRODUCT! i had breakage in the front of my hair from bleach and it repaired the damage so fast and left my hair feeling soft and silky !
Date published: 2025-12-01
Rated 5 out of 5 by from Works like a dream. This mask has been a life saver for me. I bought this for personal use. My salon does not offer K18 products however as a special treat for special clients, I will give them the full K18 treatment.
Date published: 2025-11-27
Rated 5 out of 5 by from Forever a repurchase I have tried a couple of different things that say they compete with k18 and nothing has come close. I finish all of my blonds with and it just makes their hair feels amazing. Keeps the hairs integrity intact no matter how light you are going. Such a great tool to keep clients coming back over and over again.
Date published: 2025-11-15
Rated 5 out of 5 by from A game changer performed 100% Can’t say enough about how wonderful this product!!!
Date published: 2025-11-14
Rated 1 out of 5 by from Not that great I switched my clients to using this instead of olaplex and I really don’t get the hype . It wasn’t great and don’t do any better then olaplex products do
Date published: 2025-11-13
Rated 5 out of 5 by from Great Fabulaous,works A it should in helping damaged hair
Date published: 2025-11-10
Rated 5 out of 5 by from The absolute best! This is hands down the best leave in that the professional market has. It works for all hair types and my clients love it!
Date published: 2025-11-10
Rated 5 out of 5 by from love k18 Really love using this before toning, and the spray before highlighting. Hair feels so healthy and shiny. Clients love it and notice a big difference.
Date published: 2025-11-04
Rated 5 out of 5 by from This is a fantastic product! Fantastic!!! I’ve thoroughly been enjoying it on every client and have been very happy with the results and the way it leaves the clients hair feeling so strong and soft.
Date published: 2025-10-29
Rated 5 out of 5 by from Wow! This product has done wonders for myself and several salon guests with overly sensitized hair from chemical processing. The hair texture has changed both visibly and the feel. Guests were slightly hesitant due to the price, but have all come back very happy and agreeing that the outcome has been worth the price.
Date published: 2025-10-16
Rated 5 out of 5 by from Saved My Hair This has saved many a person. The front of my hair is fine, thin, and easily damaged. This repairs any damage to keep my face-frame strong.
Date published: 2025-09-22
Rated 5 out of 5 by from Absolutely love K-18 Very happy with the fast shipping and always having very protective packaging so no products are damaged
Date published: 2025-09-16
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  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.46
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