CurlBond Re-Coiling Split End Serum is a leave-in from DevaCurl formulated with the same CurlBond Complex used in the brand's CurlBond Mask, but built as a lightweight, no-rinse product rather than a rinse-out mask. It's applied to wet curls with focus on the ends and any visibly damaged sections, then left in rather than washed out. Where the mask is a weekly deep-repair step, this serum is meant for more frequent use, helping seal the appearance of split ends and reduce frizz between mask uses, with conditioning agents that help smooth rough spots along the hair. It can also be smoothed onto dry ends as a touch-up. To use: shake before applying, work a small amount through wet curls concentrating on ends and damaged areas, do not rinse, then follow with regular DevaCurl styling products.