I was hesitant about not using conditioner and using K18 as a leave-in conditioner instead, but it made my hair feel significantly softer. I like how it is not heavy or does not change the weight of my hair. I still used my hair oil to control frizz, but my hair is naturally on the frizzier side. I saw real results in a short amount of time. I loved it and will continue using it! This size of the bottle is also perfect for traveling this summer. Jenna Wojciechowski, Fashion Market Editor Ensure to clarify your hair before using the mask by using K18 PEPTIDE PREP™ Detox Shampoo. Use for 4-6 shampoos in a row for progressive results.

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. 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. Let sit for 4 minutes. Do not rinse out. The K18 professional molecular repair hair mask is meant to be used as the second part of the K18 molecular repair service. Strengthen your hair and improve elasticity whilst reversing the damage caused by chemical treatments, mechanical styling, and heat styling. This leave-in treatment takes just 4 minutes to reverse hair damage by harnessing the power of the K18PEPTIDE™. Working at the innermost layer of your hair, the K18PEPTIDE™ reconnects the polypeptide chains and disulfide bonds that are broken because of chemical services, heat damage, and bleaching services. The peptide helps to renew strength and elasticity, giving you healthier, bouncy hair – even in cases of severe damage. It's worth noting that the brand recommends working it into the hair from the ends to the roots, however I did actually avoid the roots at first as I was worried about them looking (and feeling) greasy.The K18 Leave-In Molecular Repair Hair Mask is an award-winning haircare product—it’s been compared to (and is purportedly more effective than) the industry standard, Olaplex’s No. 8 hair mask. K18’s hair mask has even been hailed as a replacement for conditioner. Does it actually work? Four W editors put it to the test, and gave their honest opinions.

Wait 4 minutes after chelating**, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition. 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. 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). Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends. By reconnecting these polypeptide chains, the mask strengthens along the length and width of the hair, offering a full 360 approach.

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