Professional Molecular Repair Hair Mask 150mL

Professional Molecular Repair Mask pump gif 150 mL

Professional Molecular Repair Mask swatch 150 mL

Before and After Results for Coily Hair K18 Treatment

Before and After Results for K18 with Balayage

Before and After Results for Wavy Hair with K18 Treatment

Before and After Results for K18 treatment

professional molecular repair mask

part of the K18 PRO Service

Rated 4.9 out of 5

Based on 277 reviews

150 mL

This part of the PRO service is a peptide-powered treatment to repair in-salon damage from bleach + color, chemical services, and heat in just 4 minutes. Typically used toward the end of the salon service, the pH level of 5.0–6.0 helps close down the cuticle to seal in the K18PEPTIDE™ for renewed strength + elasticity where it matters.

Repairs Damage Caused By

Bleach + Color
Heat
Chemical Services

Professional Only

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more to know

The PRO mask is engineered to do cleanup duty after bleach + color, chemical services, and heat—restoring strength + elasticity to damaged strands. Lightweight conditioning benefits give your clients smooth, soft, strong, and bouncy hair, even after all the 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 strengthen their canvas so you can go further during the next appointment.

how to optimize K18

Do clarify before K18 if you’re a heavy product user (demineralize for hard water buildup)
Do apply on clean, damp hair (think about 65% wet)
Do wait the full 4 minutes before combing or styling
Do add whatever styling products you love afetr the 4 minutes

Don’t use conditioner before applying K18 Mask (you can apply after the 4 min but most find they don’t need it)
Don’t overdo it—less is more
Don't rinse it out

how to use

Shampoo, do not condition.
Towel dry thoroughly.
Part hair into equal sections. Begin with 1 pump of K18 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.
Let sit for 4 minutes to activate. Do NOT rinse out.
Style as usual.
If cutting, you may start right away.
If toning, use K18 Mask then apply toner over K18 Mask. Process as usual. Rinse/shampoo toner, towel-dry thoroughly. Reapply K18 Mask as per instructions above. Style as usual.

key benefits

Infused with our patented K18PEPTIDE™, clinically proven to reverse damage in just 4 minutes.
Repairs damage from bleach + color, chemical services, and heat.
Restores strength, softness, smoothness, and bounce for all hair types.
Lasting + progressive results get better with continued use
Vegan, color-safe, cruelty-free

With just one salon treatment using the K18 PRO Service (PRO mist + 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.

ingredients

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.

Description

backed by science,
loved by stylists

Our community of stylists and colorists in 33 countries believe K18 is liberating hair—no matter the hair type or generation.

Reverse damage & reestablish curl pattern on dry, coarse hair with K18 Mask.

Bring brittle aging hair back to its youthful state with K18 Mask & Mist.

Protect the strength & integrity of hair during an extreme color transformation with K18 Mist & Mask.

Restore & strengthen hair with K18 Mist & Mask during highlights service.

how to use K18

lightener / bleach
1. Prep hair by lightly misting with water.
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes to allow K18 to penetrate hair strands. DO NOT rinse out (this is a good time to mix color or prepare your lightening service.)
4. Dry hair if needed. Apply the lightener directly on top of K18 PRO mist and process as usual.
5. Shampoo hair, do not condition. Towel dry thoroughly until about 65% damp.
6. Start with 1 pump at a time of the K18 PRO mask, spreading it between your hands to evenly distribute the highly concentrated formula (add more as needed to encounter any missed strands. Average use is 2 pumps, most extreme thick or curly–coily hair use 3 pumps max.)
7. Leave for 4 minutes before styling. DO NOT rinse out.
8. If toning, apply toner or gloss on top of K18 PRO mask. Process toner or gloss as required. Shampoo and rinse. Towel dry thoroughly. Follow with a secondary application of K18 PRO mask.
9. Wait 4 minutes before combing, then style, and add product as usual.
color
1. Prep hair by lightly misting with water
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes to allow K18 to penetrate hair strands. DO NOT rinse out (this is a good time to mix or prepare for your color service.)
4. Dry hair if needed. Apply color directly on top of K18 PRO mist and process as usual.
5. Shampoo hair, do not condition. Towel dry thoroughly until about 65% wet.
6. Start with 1 pump at a time of the K18 PRO mask, spreading it between your hands to evenly distribute the highly concentrated formula (add more as needed to encounter any missed strands. Average use is 2 pumps, most extreme thick or curly–coily hair use 3 pumps max.
7. Wait 4 minutes before combing, then style and add product as usual.
keratin straightener
1. Prep hair by lightly misting with water.
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes for K18 to penetrate. DO NOT rinse out.
4. Clarify per your keratin straightener instructions (1-7 times).
5. Apply and process keratin straightener as usual.
*for best results, wait 3-4 shampoos post-treatment before using the K18 PRO mask in the salon or at home.
relaxer
1. Prep hair by lightly misting with water.
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes to allow K18 to penetrate hair strands. DO NOT rinse out. (this is a good time to prepare your relaxer solution.)
4. Apply relaxer directly on top of K18 PRO mist and process as usual.
5. Start with 1 pump at a time of the K18 PRO mask, spreading it between your hands to evenly distribute the highly concentrated formula (add more as needed to encounter any missed strands. Average use is 2 pumps, most extreme thick or curly–coily hair use 3 pumps max.)
6. Let sit for 4 minutes to activate.
7. Follow with neutralizing shampoo, do not conditioner. Towel dry thoroughly until about 65% wet.
8. Re-apply K18 PRO mask. Wait 4 minutes before combing, then style and add product as usual.
perm
1. Prep hair by lightly misting with water.
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes to allow K18 to penetrate hair strands. DO NOT rinse (use this time to prepare your perm solution.)
4. Apply perm solution directly on top of mist.
5. Rinse and follow with neutralizer as usual.
6. Rinse neutralizer and re-apply K18 PRO mist. Let sit for 4 minutes before styling.
*don’t use K18 PRO mask after your perm service to avoid weighing down fresh curls.
thermal reconditioner
1. Prep hair by lightly misting with water.
2. Generously apply K18 PRO mist section by section.
3. Wait 4 minutes for K18 to penetrate. DO NOT rinse out. (this is a good time to prepare your thermal reconditioner solution.)
4. Apply and process as usual.
5. Rinse and apply neutralizer.
6. Once neutralizer has processed, rinse, lightly shampoo, then towel dry thoroughly until about 65% wet.
7. Start with 1 pump at a time of the K18 PRO mask, spreading it between your hands to evenly distribute the highly concentrated formula (add more as needed to encounter any missed strands. Average use is 2 pumps, most extreme thick or curly–coily hair use 3 pumps max.)
8. Wait 4 minutes before combing, then style and add product as usual.

how K18 works

Traveling into the innermost layers of hair, our K18Peptide™ renews strength along the width AND length of hair for lasting strength where it matters.

have questions?

we have answers.

who is k18 mask for?

K18 is safe to use on all hair types and textures, all generations, and was made to be used on all types of damage.

how do you use k18 mask as part of a lighting or color service?

K18 Mask is used after processing bleach/color by following the below steps.
- Shampoo hair. Skip the conditioner.
- Towel-dry thoroughly.
- Apply K18 Mask, the amount needed depends on client’s hair type and condition. Reference chart for approximate dosage.
- Leave for 4 minutes before styling. DO NOT rinse out.
- If cutting, begin right away. Make sure to wait the full 4-minute wait period before heat styling.
- If toning, apply toner/gloss on top of K18 Mask. Process toner/gloss as required. Shampoo and rinse. Follow with a secondary application of K18 mask. Towel dry thoroughly. Style as usual.

will applying toner on top of k18 mask affect the outcome of my color?

K18 will not interfere with toner or final color. Colorists tell us K18 Mask actually improves their results, as it evens out the hair’s porosity, creating a more uniform and vibrant color application.

how do i use k18 mask during a haircut or as a treatment on its own?

Follow these steps to use K18 with a hair cut or alone as a treatment service.
- Shampoo and rinse. Skip the conditioner.
- Towel dry thoroughly.
- Apply K18 Mask, the amount needed depends on client’s hair type and condition. Reference chart for approximate dosage.
- Wait 4 minutes. DO NOT rinse. If cutting, begin right away.
- Make sure to wait 4 minutes before heat styling or using other styling products. If needed, you may also condition or add a leave-in once 4 minutes has elapsed with K18.

can i use k18 mist + mask together?

These formulas are intended to be used at separate times during the service but work together to renew damaged hair from the inside out.

During a chemical service, K18 Mist is applied prior to chemical application. K18 Mask is applied post-service to renew damaged caused during the chemical service.

During a few services, you will only use theK18 Mist in the salon. During a perm for example, K18 Mist is applied before the perm solution, K18 mist is then reapplied again after the neutralizer instead of the mask to avoid additional weight on newly formed curls.

is k18 a replacement for conditioner?

K18 was created to restore hair’s strength and elasticity by reconnecting broken polypeptide chains (keratin chains) responsible for hair’s core structure. Detangling and conditioning benefits are often a bonus clients experience from K18 use. Once K18 Mist or Mask has been applied and you’ve waited the initial 4-minute wait period, you can add a leave-in conditioner. Most stylists tell us the K18 Mask alone provides all the necessary conditioning for their client’s hair.

reviews

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average rating 4.9 out of 5

Based on 277 reviews

5 Stars

262 Reviews
4 Stars

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3 Reviews
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1 Star

1 Review

99% of reviewers would recommend this product to a friend

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277 Reviews

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Reviewed by Jacqueline D.

Verified Buyer

I recommend this product

Age

45 - 54

Hair Concern

Chemical damage
Dryness
Heat damage
Frizz
Color-care

Hair Type

Fine/Thin

My Results

Less Frizz
Visible Difference
Bouncy Hair
Stronger Hair
Less Breakage

Rated 5 out of 5

Review posted

K18 treatment

Amazing product! Leaves damaged hair feeling healthy and strong. I will continue to use this product on my clients. Absolutely love it!

Was this helpful?

Reviewed by Jesseca Alosaimi F.

Verified Buyer

I recommend this product

Age

35 - 44

Hair Concern

Chemical damage

Hair Type

Medium Density
Straight/Wavy

My Results

Less Frizz
Shinier Hair
Visible Difference

Rated 5 out of 5

Review posted

I’m a believer

I didn’t want to believe the hype and finally gave it. This product is amazing and makes the hair feel so gorgeous.

Was this helpful?

K18Hair PRO

Thank you for your review Jesseca.

Reviewed by Samantha K.

Verified Buyer

I recommend this product

Age

35 - 44

Hair Concern

Dryness
Split-Ends
Chemical damage
Color-care

Hair Type

Medium Density

My Results

Stronger Hair
Less Breakage
Visible Difference
Less Frizz
Smoother Hair

Rated 4 out of 5

Review posted

Forget about Olaplex

I was in some of the original launch program for other products claiming similar results years ago. I can tell you hands down they are not as effective as K-18 has proven to be. As a professional I had a bit of a curve with my preferences after directed use on myself and clientele. If you are a salon owner or professional this is a must.

Was this helpful?

K18Hair PRO

Thank you for your awesome review Samantha!

Reviewed by Andrew T.

Verified Buyer

I recommend this product

Age

45 - 54

Hair Concern

Heat damage
Fragile/brittle hair
Chemical damage
Color-care
Dryness

Hair Type

Fine/Thin
Grey Hair
Straight/Wavy
Thick/Coarse
Medium Density

My Results

Defined Curl/Wave Pattern
Soft Touchable Hair
Smoother Hair
Less Breakage
Visible Difference

Rated 5 out of 5

Review posted

The most important tool at my station.

After over 60 thousand hours of work in the hair industry. This molecular repair mask is unparalleled. It does exactly what it is designed for.

So many of my clients have purchased it for home use. Every time they return they say, “My hair texture is so much better”, “Look at how good my natural waves behave!”, “I love how blonde and healthy my hair is!”.

Thanks K18!

Was this helpful?

K18Hair PRO

Thank you for your awesome review Andrew!

Reviewed by Tasia l.

Verified Buyer

I recommend this product

Age

35 - 44

Hair Concern

Chemical damage
Fragile/brittle hair
Split-Ends

Hair Type

Fine/Thin

My Results

Visible Difference
Soft Touchable Hair
Shinier Hair
Less Breakage

Rated 5 out of 5

Review posted

Hands down the best product in the hair world

If you are not using k18 on every client you are not doing it right! This is the best product I have ever come across. Within one use you can instantly tell a difference.

Was this helpful?

K18Hair PRO

Thank you for your awesome review Tasia.

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leave-in molecular repair hair mask

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4-minute leave-in treatment to reverse hair damage

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DOSAGE CALCULATION

pre-service

Apply a generous amount to damp hair, section by section

post-service

3 pumps
throughout the hair

How to use

Prep hair by lightly misting with water.
Apply K18 Mist section by section.
Wait 4 minutes. DO NOT rinse. (This is a good time to mix or prepare for your Lightening Service.)
Apply Lightener directly on top of K18 Mist. (Dry hair if needed prior to application.)
Process as usual.
Shampoo hair. Skip the conditioner.
Towel dry thoroughly.
Apply K18 Mask.
Leave for 4 minutes before styling. DO NOT rinse out.
If toning, apply toner / gloss on top of K18 Mask. Process toner / gloss as required. Shampoo and rinse. Towel dry thoroughly. Follow with secondary application of K18 Mask for 4 minutes.
Style as usual.

optimize K18

skip the conditioner

Conditioners coat hair making it harder for our K18Peptide™ to effectively penetrate strands and get into the inner layers of hair. We like to skip it so the peptide can get right to damage sites without interruption. If strands need a little more love, you can add a leave-in conditioner once the initial 4-minute wait period is over.

clarify first

Excessive product or mineral buildup on hair can prevent our K18Peptide™ from effectively penetrating strands. If hair is heavy with buildup, start with a clarifying treatment before using K18 to remove residue that may block our peptide from getting where it needs to go.

continue use

Damage is ongoing, so clients' use of K18 should be too. This progressive treatment makes hair healthier with each use. Continue their hair renewal at home by using K18 for the first 4-6 washes, then every 3-4 washes to maintain the integrity of damaged hair.

less is more

Our Pro Mask is highly concentrated, meaning a little goes a long way. Don’t oversaturate hair and refer to our dosage chart to find the optimal amount for each client’s hair type and service.

more is more

When using the Pro Mist, the more the merrier to reset damage before a chemical service. Use pre-service for a healthy canvas by applying a generous amount of the Pro Mist to damp hair, section by section.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

clarify first

more is more

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

clarify first

continue use

more is more

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

skip the conditioner

clarify first

continue use

less is more

Our Pro Mask is highly concentrated, meaning a little goes a long way. Don’t oversaturate hair and refer to our dosage chart to find the optimal amount for each client’s hair type and service.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

professional molecular repair mask

Repairs Damage Caused By

Professional Only

more to know

how to optimize K18

how to use

key benefits

ingredients

Description

backed by science,
loved by stylists

how K18 works

have questions?

who is k18 mask for?

how do you use k18 mask as part of a lighting or color service?

will applying toner on top of k18 mask affect the outcome of my color?

how do i use k18 mask during a haircut or as a treatment on its own?

can i use k18 mist + mask together?

is k18 a replacement for conditioner?

K18 treatment

I’m a believer

K18Hair PRO

Forget about Olaplex

K18Hair PRO

The most important tool at my station.

K18Hair PRO

Hands down the best product in the hair world

K18Hair PRO

recommended products

K18 Pro Dosage Calculator ×

Type of service

Hair length

Hair Thickness

based on your client + service

DOSAGE CALCULATION

How to use

did you know

professional molecular repair mask

Repairs Damage Caused By

Professional Only

more to know

how to optimize K18

how to use

key benefits

ingredients

Description

backed by science, loved by stylists

how K18 works

have questions?

who is k18 mask for?

how do you use k18 mask as part of a lighting or color service?

will applying toner on top of k18 mask affect the outcome of my color?

how do i use k18 mask during a haircut or as a treatment on its own?

can i use k18 mist + mask together?

is k18 a replacement for conditioner?

K18 treatment

I’m a believer

K18Hair PRO

Forget about Olaplex

K18Hair PRO

The most important tool at my station.

K18Hair PRO

Hands down the best product in the hair world

K18Hair PRO

recommended products

K18 Pro Dosage Calculator ×

Type of service

Hair length

Hair Thickness

based on your client + service

DOSAGE CALCULATION

How to use

client recommendation

At-Home Treatment

2 pumps

optimize K18

skip the conditioner

clarify first

continue use

less is more

more is more

made for all

optimize K18

clarify first

more is more

made for all

optimize K18

clarify first

continue use

more is more

made for all

optimize K18

skip the conditioner

clarify first

continue use

less is more

made for all

Type of service

Hair length

Hair Thickness

based on your client + service

DOSAGE CALCULATION

How to use

client recommendation

At-Home Treatment

2 pumps

optimize K18

skip the conditioner

clarify first

continue use

less is more

more is more

made for all

optimize K18

clarify first

more is more

made for all

backed by science,
loved by stylists