Head to Head
Kerastase Ciment Thermique vs Redken Quick Blowout
Two L'Oreal professional blow dry primers compared: Kerastase's strengthening thermique milk for damaged hair against Redken's flash drying bi-phase spray, both carrying a printed 450 degree figure.
Kérastase Resistance Ciment Thermique Blow-Dry Primer
The blow dry milk for weakened hair: a strengthening leave in cream that the brand publishes with heat protection up to 450 degrees F.
Redken Quick Blowout Heat Protectant Spray
The fast blow dry spray: a lightweight bi-phase primer whose flash drying formula is built to shorten the blow dry while it protects.
Where They Differ
Texture and application
Ciment Thermique is a milk worked through towel dried hair with the palms at a chestnut sized dose, giving deliberate, hand checked coverage. Quick Blowout is shaken and misted, faster and lighter, with coverage that depends on spraying in sections. Cream forgives uneven technique less visibly but coats more certainly; spray is quicker and easier to under apply on the underlayers.
What each formula optimises
The Kerastase optimises the condition of damaged hair, with its Pro-Keratine Complex and Vita-Topseal named for resurfacing and strengthening care. The Redken optimises the clock, with a flash drying formula positioned to reduce styling time and a smoothing, shine led finish. Read the two bottles side by side and the brief split is total: repair adjacent care versus speed.
Tier and size
Ciment Thermique sits at the luxury tier in a 150 ml tube. Quick Blowout sits at the premium tier in a 125 ml bottle. Dose for dose the cream is worked further by hand, while the spray is spent faster on long hair; cost per blow dry is closer than the tier gap suggests, and both are sold through official professional brand channels on Amazon as recorded on their entries.
The Specification, Side by Side
| Measure | Kérastase Resistance Ciment Thermique Blow-Dry Primer | Redken Quick Blowout Heat Protectant Spray |
|---|---|---|
| Size | 150 ml / 5.1 fl oz | 125 ml / 4.2 fl oz |
| Format | Leave in blow dry milk, tube | Bi-phase blow dry primer spray, shake before use |
| Heat Protection | Up to 450 degrees F, as printed on the brand's US listing for this product | Up to 450 degrees F / 230 degrees C, printed on the bottle front as a flash drying heat protecting formula |
| Use | Apply a chestnut sized amount to washed, towel dried hair, massage through lengths and ends, blow dry or heat style, as directed on the listing | Shake well, mist onto damp hair, blow dry as usual, as directed by the brand |
| Key Ingredients | Pro-Keratine Complex and Vita-Topseal, as named by the brand | Not published |
| Hair Type | Not published | All hair types and textures, as printed on the listing |
Choose Kérastase Resistance Ciment Thermique Blow-Dry Primer if
- Your hair is damaged, bleached or chemically serviced and needs care with its protection
- You blow dry with a brush and prefer hand applied, certain coverage
- Your hair is thick or coarse enough that sprays feel insufficient
Choose Redken Quick Blowout Heat Protectant Spray if
- Your blow dry takes too long and shortening it is the real brief
- Your hair is fine to medium and creams weigh it down
- You want the lighter, faster routine at the premium tier
Questions, Answered
Which is better before following the blow dry with a flat iron?
Both carry a printed 450 degree figure and both are applied before the dryer, so either base covers the iron that follows in the same session. The Kerastase leaves more conditioning film in the hair, which damaged hair appreciates under plates; the Redken leaves the lighter finish fine hair prefers. Choose by hair condition, not by the iron.
Keep Researching
Every page in the Heat Protectants edit.
- 01Heat Protectants: the hubHub
- 02Best Heat Protectants 2027Best of
- 03Spray vs Cream vs Serum Heat ProtectantsGuide
- 04How to Apply Heat Protectant ProperlyGuide
- 05Heat Protectant for Fine HairGuide
- 06Kerastase Ciment Thermique ReviewReview
- 07Color Wow Dream Coat Supernatural Spray ReviewReview
- 08OUAI Leave In Conditioner ReviewReview
- 09Olaplex No.9 Serum vs OUAI Leave In ConditionerComparison
- 10Heat Protectants Buying GuideBuying guide
- 11Heat Protectant Care and Keeping: Fixing Steaming, Stickiness and Styles That Will Not HoldCare
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