Frequently asked questions
Does heat-protectant spray actually work?
Both Everette and Michael agree that heat protectants are effective and non-negotiable. It “works by forming a thin, protective barrier over the hair shaft, which helps to reduce direct heat exposure from styling tools like flatirons, curling wands, hot combs, or blow-dryers,” explains Everette. She adds that this barrier distributes heat more evenly to prevent “hot spots” and often contains silicones or proteins that smooth the cuticle and reduce frizz. Michael highlights the risks of skipping it, noting, “If you don’t use a heat protectant, hot tools can strip moisture, weaken the hair’s protein structure, and lead to dryness, breakage, and dullness over time.”
Should I apply heat protectant to wet or dry hair?
Everette advises starting with clean, damp hair, noting, “part into four to six sections and spray or distribute the product evenly from mid-lengths to ends, avoiding the roots to prevent greasiness.” She recommends using a wide-tooth comb for even coverage and letting the product dry completely before heat styling to avoid sizzling. For touch-ups, she adds, “Use a lightweight heat protectant formulated specifically for dry application.”
Michael breaks it down by formula, explaining, “For sprays, hold the bottle six to eight inches away and mist evenly on damp or dry hair, making sure to cover from mid-lengths to ends without oversaturating.” He notes that “cream or serum versions should be applied sparingly to damp hair—work a small amount between your palms, then distribute evenly with your hands or a wide-tooth comb. Focus on the ends, since they’re the oldest and most fragile part of the hair.”
Do you let heat protectant dry before styling?
Heat protectants come in a range of textures, from liquid sprays to cream and serums, and for most, “You don’t wait for it to dry because they’re typically formulated and designed to apply on wet or damp hair just before the blow-dry,” says NYC-based hairstylist Cataanda James. She notes that products made for use on already blown-out hair tend to dry faster than those designated for wet application. Plus, those post-dry serums are usually used for straightening or curling irons, whereas most sprays are better for use before any heat; but for curly hair, they can revert blown-out hair if water-based, so it’s better to use a post-blow serum for additional heat protection.
Is it bad to put too much heat protectant on hair?
Yes, overdoing heat protectant can backfire. “I am a stickler for lightweight, flowy hair and too much heat protectant can compromise the feel and flow,” James explains. When applied moderately on wet or damp hair, “it absorbs deeper into the strand and allows the round brush or dryer attachment to glide through the strands with ease as the hair dries. Too much, though, just coats the strands, leading to buildup and a weighed-down feel,” says James.
Meet the experts
How we test and review products
When Allure tests a product, our editors look at it from every angle in an effort to best serve you. We review ingredients, scrutinize brand claims, and, when necessary, examine peer-reviewed scientific and medical studies. In addition to testing each and every product that’s included in each and every review, we rely on experts who shape their fields, including dermatology, cosmetic chemistry, and medicine, to help us vet the ingredients and formulas.
For our list of best heat-protectant sprays, we considered each product’s performance across five primary categories: product ingredients and efficacy, packaging, fragrance, texture, and product wear. Every product was determined to have excelled in each category by our editorial team, which is composed of in-house writers and editors as well as contributors—along with special consideration from dermatologists. To learn more information on our reporting and testing processes, read our complete reviews process and methodology page.
Our staff and testers
A beauty product is a personal purchase. You might be searching for a face cream to address persistent dryness or a new nail product to add to your Sunday self-care routine; you may simply be browsing around for the latest launches to hit the hair market. No matter what you seek or your individual needs and concerns, Allure wants to ensure that you love anything we recommend in our stories. We believe that having a diverse team of writers and editors—in addition to the wide range of outside testers and industry experts we regularly call upon—is essential to reaching that goal.
After all, can we really say a skin-care product is the “best” for people over 50 if the only testers we’ve solicited opinions from folks who have yet to hit 30? Can we honestly deem a high-end diffuser worthy of your hard-earned cash if it’s never been tested on curls? We’re proud that our staff spans a wide range of ages, skin tones, hair textures, genders, and backgrounds, which means that we are able to fairly assess any beauty product that comes into the beauty closet.
