Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE) (2025)

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

4. Wait 4 minutes (do not rinse out).

5. If needed, dry the hair prior to applying lightener or color. Then perform your desired technique.

6. Process your lightener or color as usual, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.

7. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

8. Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.

9. Wait 4 minutes, then proceed with cut or style as usual.

10. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.

Please see the “K18 + toning or glossing” section for more information on toning with K18.

1. Process lightener or color as usual, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.

2. Apply a minimum of 10 full sprays of K18 professional molecular repair hair mist per quadrant, increasing up to 20 sprays as needed, depending on client’s length, density, or level of damage.

3. Wait 4 minutes (do not rinse), then apply toner or gloss.

4. Process toner or gloss as usual, then rinse. If shampooing, follow with DAMAGE SHIELD pH protective shampoo. Do not condition.

5. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

6. Wait 4 minutes, then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.

7. Wait 4 minutes, then proceed with cut or style as usual.

8. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating**, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.

4. Towel dry hair, then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

5. Wait 4 minutes (do not rinse), then wrap, process, and neutralize perm as usual.

6. Once perm is complete, remove rods and gently towel dry.

7. Apply a minimum of 10 full sprays of K18 professional molecular repair hair mist per quadrant, increasing up to 20 sprays as needed, depending on client’s length, density, or level of damage.

8. Wait 4 minutes (do not rinse), then proceed with cut or style as usual.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.

To avoid weighing down fresh curls, it is not recommended to use the K18 professional molecular repair hair mask or oil immediately after completing a perm service.

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

4. Wait 4 minutes (do not rinse out) and if needed, dry the hair prior to beginning relaxer application.

5. Apply + process relaxer as usual, then rinse thoroughly.

6. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

7. Wait 4 minutes (do not rinse), then follow with neutralizing shampoo. Do not condition.

8. Towel dry thoroughly, then re-apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

9. Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.

10. Wait 4 minutes, then proceed with cut or style as usual.

11. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating**, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.

4. Towel dry hair, then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

5. Wait 4 minutes, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

6. Wait 4 minutes, then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.

7. Wait 4 minutes, then style as usual.

8. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

4. Wait 4 minutes (do not rinse out). Then follow with the recommended shampoo per your keratin straightener service instructions.

5. Apply and process keratin straightener as usual.

6. Apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends on dry hair as a finisher.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.

Wait 3-4 shampoos post-treatment before using the K18 molecular repair hair mask in the salon or at home.

On natural hair (prior to installation):

1. Section dry hair into 4 quadrants.

2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.

3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

4. Wait 4 minutes, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo (do not condition)

5. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, only to the ends and mid-lengths (avoiding the root).

6. Wait 4 minutes (do not rinse), then proceed with extension installation as usual.

Using K18 on extensions alone or on clients with previously installed extensions:

K18 is suitable for use on all human hair extensions (to include tape-in, k-tip, hand tied, clip-in, sew-in, etc.). For information on using K18 on clients with previously installed extensions, please follow the instructions for the specific service being performed.
PRO tip: When working on clients with tape-in extensions, we recommend following the standard protocol for cream-based conditioner or oil usage. For best results, do not apply the K18 professional molecular repair hair mask or molecular repair hair oil directly to the weft adhesive or to the natural hair immediately surrounding the adhesive as it could cause slippage.

*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.