K18 AstroLift™ Reparative Volume Spray 118ml

Give flat, fine or fragile hair fuller-looking volume without stiffness, crunch or heavy buildup with K18 AstroLift™ Reparative Volume Spray 118ml. This lightweight, buildable volumizing spray combines instant styling performance with K18's patented K18PEPTIDE™ technology to help repair the damage that can leave hair weak, flat and lacking bounce.

AstroLift™ delivers 2x more all-over volume and up to 2 days of touchable volume and bounce, while its Hair Fiber Volumizing Blend can increase the diameter of individual hair fibers by up to 25%, helping create space between strands for a visibly fuller look and feel.

Unlike traditional volumizing products that can leave fine hair sticky, stiff or overloaded, AstroLift™ is designed for soft, flexible, touchable volume. It can be applied to towel-dried or dry hair, works with or without heat and can even be reapplied between washes when hair needs its bounce brought back.

Repair → Lift → Plump → Add Bounce → Maintain Touchable Volume

Why You'll Love It

• Creates 2x more all-over volume
• Provides up to 2 days of touchable volume and bounce
• Increases individual hair-fiber diameter by up to 25%
• Powered by patented K18PEPTIDE™
• Helps repair damage that can reduce natural bounce
• Adds fullness from roots through lengths
• Lightweight and buildable
• Non-sticky finish
• No stiff or crunchy feeling
• Helps protect against humidity
• Works on towel-dried or dry hair
• Can refresh volume between washes
• Works with or without heat
• Particularly suitable for fine, fragile and aging hair

What Does K18 AstroLift™ Reparative Volume Spray Do?

Fine hair can naturally lack body, but damage can make the problem worse. When hair becomes compromised through coloring, heat and mechanical styling, it can lose strength and bounce, making lengths appear flatter and less full.

AstroLift™ approaches volume from both sides.

Inside the hair, patented K18PEPTIDE™ helps address damage that can compromise bounce.

On the outside, its Hair Fiber Volumizing Blend increases the diameter of individual fibers by up to 25% and creates space between strands, helping the overall head of hair appear fuller.

A humidity-resistant natural polymer then forms a lightweight protective barrier to help maintain the style without sacrificing natural movement.

The result isn't simply root lift:

Fuller-looking hair + more body + more bounce + damage repair

Who Is It For?

Ideal for:

• Fine hair
• Thin-looking or low-density hair
• Flat hair lacking volume
• Fragile hair
• Aging hair that has lost body
• Color-treated hair
• Damaged hair lacking bounce
• Hair that becomes weighed down by mousse or heavy styling creams
• Flat roots
• Fine ends that look stringy
• Hair affected by humidity
• Anyone wanting a fuller-looking blowout
• Anyone wanting touchable volume rather than stiff hold

Pair Me With

• K18 Leave-In Molecular Repair Hair Mask – intensive 4-minute molecular repair for damaged, bleached, colored or chemically processed hair.
• K18 HeatBounce™ Conditioning Heat Protectant – conditioning heat protection before creating a volumized blowout with heat.
• K18 AirWash™ Dry Shampoo – absorbs oil and refreshes roots between washes while helping preserve a fresh, voluminous look.

What's the Best Volumizing Spray for Fine Hair That Won't Weigh It Down?

This is the main problem AstroLift™ is designed to solve.

Fine hair often needs volume but can be easily overwhelmed by mousses, creams, oils and heavy styling polymers. Too much product can actually make the hair look flatter.

AstroLift™ uses a lightweight, buildable, non-sticky spray to increase hair-fiber diameter and create separation between individual strands without sacrificing movement.

This positioning is also supported by real-world feedback. A 2026 Cosmopolitan review from an editor with very fine, thin hair reported fuller-looking, softer hair without the greasy or tacky feeling she commonly experienced with volumizing products.

For fine hair, the goal is:

More Volume – More Weight

Can K18 AstroLift™ Make Thin Hair Look Fuller?

Yes — visually, but it's important to distinguish styling volume from biological hair growth.

AstroLift™ does not grow new hair or increase the number of follicles.

Instead, K18's Hair Fiber Volumizing Blend can increase the diameter of individual hair fibers by up to 25%, while creating more space between strands. This makes the existing hair look and feel fuller.

This makes it particularly useful for fine, low-density or aging hair where the objective is immediate visible fullness and bounce.

Do I Need to Blow-Dry K18 AstroLift™ for It to Work?

No.

AstroLift™ does not require heat activation. K18 states that the formula provides volume even without heat, so it can also be used when air-drying.

However, blow-drying can enhance the volumizing effect, particularly when you're looking for stronger root lift and a fuller salon-style blowout.

You can also apply AstroLift™ to dry hair between washes to refresh volume and bounce

AstroLift™ reparative volume spray | K18Hair

AstroLift™ can be applied to towel-dried or dry hair.

Shake well.
Hold approximately 4–6 inches / 10–15 cm from the roots and hair.
Spray generously throughout.
Distribute where additional body and fullness are needed.
Blow-dry for enhanced volume, or style without heat.
For Maximum Blowout Volume

Apply throughout towel-dried hair, including the roots and lengths.

Blow-dry while lifting the roots with your preferred brush.

Focus airflow against the natural direction of growth at the roots when additional lift is wanted.

For Second-Day Hair

Apply lightly to dry hair where volume has fallen, then restyle as needed.

For Best K18 Repair Results

K18 recommends allowing 4 minutes after applying AstroLift™ for the best repair results from K18PEPTIDE™.

Water (Aqua) (Eau), Alcohol Denat., Maltodextrin/VP Copolymer, Propanediol, PVP, Polysorbate 20, Benzyl Alcohol, Ascorbic Acid, Tocopheryl Acetate, sh-Oligopeptide-78, Palmaria Palmata Extract, Arginine, Glycerin, Levulinic Acid, Hydroxyacetophenone, Glyceryl Caprylate, Polyquaternium-10, Pentylene Glycol, Sodium Citrate, Tetrasodium Glutamate Diacetate, Phenoxyethanol, Ethylhexylglycerin, Potassium Sorbate, Citric Acid, Fragrance (Parfum).