This £12 Shine Spray Has Given Me the Smoothest, Sleekest, Most Expensive-Looking Hair Ever
One beauty editor shares her full review of the Garnier Diamond Sleek Smoothing Spray.
Something I moan about time and time again is my hair. I shouldn't, really. I've been blessed with incredibly thick hair and natural waves, but if I'm being honest, I find it quite hard to deal with. Sometimes I want a smooth, sleek finish, and no matter what I do, it seems downright impossible. I've tried every conditioner, hair mask, hair oil and hot brush under the sun, and while they seem to work at first, the minute I step outside, my flyaways make an immediate return.
So, at the start of the year, when I was being briefed on the upcoming Garnier launches and the brand mentioned a new smoothing spray, I dismissed it almost straight away. It won't work on me, I thought, and the bottle got filed away in the beauty cupboard for someone else to try. However, a few weeks later, I was out with some fellow beauty editors, and they all said, "Have you tried the Garnier Diamond Sleek Smoothing Spray?" They couldn't stop singing its praises, and all of them convinced me to give it a go.
I'm so glad I did, because I can hand on heart say that this spray has transformed my strands, for the better. If you're intrigued to know more, keep on scrolling for my full review.
Garnier Diamond Sleek Smoothing Spray Review
Pros
- Creates a super sleek finish
- Smells amazing
- Affordable price point
- Lightweight feel
- Provides heat protection up to 230°C
Cons
- Doesn't add a huge amount of shine
The Formula
As mentioned, this product is a smoothing spray, but it does so much more. The keratin and argan oil-infused formula shields hair from humidity and creates a polished finish by coating the hair fibre, almost like a magic cloak. It is heat-activated, so you will need to use a hair dryer or wet-to-dry tool after applying the spray for the best results. I personally like to use my Revlon hot brush, as these two together are a match made in heaven. Don't worry about applying a separate heat protectant either, as the formula protects up to 230 °C.
The Application
As you can probably guess, you apply the product to wet hair after rinsing out your shampoo and conditioner. I like to split my hair into sections and apply liberally to each strand, focusing on the mid-lengths and ends. As soon as you spray this, you will be met with the most incredible scent. Honestly, whenever I use this, I feel like I've stepped out of a five-star salon.
The Results
The first time I used this, I was blown away. I don't think my hair has ever looked so smooth when blow-drying it at home, and it's quickly become a mainstay in my haircare routine. One thing I will say is that I personally don't find it adds loads of shine to the hair, but apart from that, I cannot fault it. The ease of application, the scent, the results and the price all get a ten out of ten from me.
While I've always been loyal to my leave-in conditioner and hair oil, I think this is the sort of product that's really been missing from my routine. Not only does it create immediate results, but it keeps my hair looking sleek for days. If you also struggle to get a sleek finish at home, I really recommend giving this a go. I'm not one to call a beauty product a miracle-worker, but this is probably as close as it gets for me.
Shop the Garnier Diamond Sleek Smoothing Spray
Shop this spray while it's on sale.
Shop More Smoothing Sprays
It's a little more expensive, but this Color Wow spray is definitely worth the hype.
A hair stylist used this on me recently and I bought it before even leaving the salon.
This two-in-one treatment works as a leave-in and a smoothing spray, alongside high heat protection.
A luxury option from Living Proof that comes in the form of an ultra lightweight mist.
Why Trust Us
At Who What Wear UK, we know that beauty isn’t one-size-fits-all. Our editors have tested thousands of products, including skincare, makeup, hair and nails, over the years and work closely with trusted experts—dermatologists, make-up artists and leading industry insiders—to ensure every guide is well-researched, inclusive and relevant to you.
We focus on formulas that deliver, whether they’re affordable favourites or luxury investments. Our product selection is based on tangible results, ingredient know-how and what we’d truly recommend to a friend.
