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Hair sealing: what is it for and when should it be done?

Published on: 04/06/2025
Updated on: September 4, 2026.
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Have you ever heard of hair sealing? Do you know what it is for and when is the ideal time to do this treatment? So get ready, because we are going to reveal all the secrets for you to achieve even more beautiful and healthy locks!

Woman with long, straight, shiny hair, looking to the side with a serene expression on a gray background.

You dream about hair smoother, frizz-free, shiny and healthy? Then you need to know about hair sealing! This powerful treatment has won hearts (and hair!) for its incredible results. 

Want to know exactly what it’s for and when is the best time to try this technique? Keep reading and get ready to discover the secret to flawless locks!

What is Hair Sealing?

Hair sealing is a reconstructive treatment which aims, as the name suggests, seal the hair cuticles. These cuticles are the outer layers of the hair, responsible for protecting the internal part, the cortex. When the cuticles are open, the hairs tend to become more porous, rough, frizzy and prone to breakage.

Sealing acts filling the cracks and irregularities of the hair fiber with nourishing and reconstructive ingredients, such as amino acids, keratin and vegetable oils. When sealed, the cuticles provide a more aligned, healthy and shiny appearance to the hair.

What is Hair Sealing for?

The benefits of hair sealing There are many options and they go far beyond simply "straightening" the hair. This includes:

  • Frizz reduction: By sealing the cuticles, the humidity in the air has more difficulty in penetrating the fiber capillary, significantly reducing frizz.
  • Increased brightness: A sealed cuticle reflects light more evenly, resulting in brighter hair with intense shine.
  • Improved softness: Filling in the cracks and aligning the cuticles leaves the hair softer to the touch.
  • Protection against external aggression: The sealing forms a protective barrier that It helps protect hair from damage caused by pollution, sun, wind, and heat from hair dryers and straighteners.
  • Prolonged hydration and nutrition: With the cuticles sealed, hydration and nutrition treatments remain “trapped” for longer within the hair fiber, enhancing its effects.
  • Helps in the recovery of damaged hair: A sealing contributes to the reconstruction of hair fiber, being a great ally for hair that has undergone chemical processes or is fragile.
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When to do hair sealing?

There is no single rule Regarding when to perform the sealing treatment, some signs may indicate that your hair needs it. this treatment:

  • Excessive frizz: If frizz has become a constant problem, even with other precautions, sealing can be the solution.
  • Porous and rough hair: When feeling the rough and lifeless strands, sealing can help restore softness and alignment.
  • After chemical processes: Hair that has been colored, bleached, straightened or relaxed tend to lose nutrients and have open cuticles. Sealing helps to replenish these nutrients and seal the cuticles, protecting the strands.
  • Dull and dull hair: If your hair lost their natural shine, sealing can revitalize them, providing a healthier and brighter appearance.
  • Feeling of “dry” hair even after moisturizing: This may indicate that the cuticles are not sealed, allowing moisture to escape quickly.
  • The frequency of sealing will depend on the needs of your hair and the products used. In general, it can be done every 15 days to 1 month.

What is Hair Sealing for?

A hair sealing is a powerful ally in the search for more aligned, shiny, soft and protected hair. By sealing your cuticles, you not only combat frizz and porosity, but you also enhances treatments hydration and nutrition, in addition to protecting the hair from external aggressions. 

Pay attention to the signals your hair gives off and, when you feel the need, consider sealing as an effective treatment to revitalize your locks. And remember, Grandha offers incredible solutions to help you achieve the hair of your dreams. How about trying it out and feeling the difference?

Author
Celso Martins Junior
  • Cosmetic engineering manager and technical manager Grandha Professional Hair Care.
  • Certified Trichologist by IAT – International Association of Trichologists (IAT – Australia).
  • CEO of the Brazilian Academy of Trichology.