What is skin flooding, and does it work?

Your face is still wet from the sink. You mist, pat in a watery toner, press a serum over it, and before any of it dries you smooth a cream on top. A minute later your skin looks plump and slightly glassy instead of tight. So what is skin flooding? That sequence, with a name. The name is new; the idea underneath it is one of the oldest in moisturizing, and whether it helps depends almost entirely on the last step.

What is skin flooding?

Skin flooding is a moisturizing routine in which you apply several thin, water-based hydrating layers to damp skin and then seal them under a moisturizer. Across the brand and magazine pages that rank for the term, the layers are usually a mist or toner, then a serum built on a humectant such as hyaluronic acid or glycerin, then a cream.

The same pages often compare it with the older Korean 7-skin habit of patting on several layers of toner. The difference is the finish: skin flooding always ends with a moisturizer that holds the water in. If you already spritz a mist before your moisturizer, you are halfway there; our guide to whether misting your face before moisturizer helps looks at that single step. We compare toner, essence, serum and ampoule in toner vs essence vs serum vs ampoule.

Does skin flooding work?

The parts of it do. Moisturizer research has long separated two jobs: humectants pull water into the skin’s outer layer, and occlusives form a film that slows that water’s escape. Skin flooding stacks the first job in several layers, then does the second.

A 2023 review in Skin Pharmacology and Physiology describes those roles and notes that moisturizers improved water loss through the skin in several studies. Glycerin, which a 2016 dermatology review calls the most effective humectant, has decades of evidence behind it: a 2008 review of glycerin (glycerol in that paper) concludes that it improves the hydration and barrier function of the skin’s outer layer, and that this matters most in dry, cold conditions such as winter. Hyaluronic acid has smaller trials. In a 2011 study, 76 women aged 30 to 60 used 0.1% hyaluronic acid creams twice a day for 60 days, and all of the versions tested improved skin hydration compared with placebo.

The evidence covers the ingredients, not the full routine compared head to head: three hydrating layers against one, with everything else the same. When a brand says flooding gives deeper hydration than a single serum, that is a claim about the routine as a whole. The reasonable reading is narrower. If your skin feels tight within an hour of moisturizing, adding a humectant layer under a proper moisturizer, on damp skin, is well supported. Adding a fourth or fifth watery layer on top of that is a matter of preference.

Why apply products to damp skin?

Because occlusives work best when there is water underneath to hold in. That 2016 review, published in the Indian Journal of Dermatology, says occlusives “have the most pronounced effect when applied to the slightly dampened skin,” and that the common occlusive oils should go on moist skin, for example after you pat yourself dry following a bath.

Humectants are the part that can work against you. The same review calls them “a double-edged weapon”: they can draw water from deeper in the skin up to the surface, where it is easily lost to the air, which is why they are mostly combined with occlusives. A routine that stacks three humectant layers and stops there could leave your skin tighter an hour later than if you had done nothing. Our guide to whether hyaluronic acid dries out skin goes further into that question.

Water on its own is not a moisturizer either. A 1999 overview of water as a skin irritant reports that water left on skin under occlusion can itself irritate and raise water loss, and proposes that it may dilute the skin’s own water-holding molecules. That argues for thin layers and a breathable finish rather than a puddle sealed in under a heavy balm.

What is a good skin flooding routine?

Keep it to three or four steps, applied quickly, with the moisturizer last. A practical evening version:

• Cleanse with lukewarm water and a gentle cleanser, then pat lightly so your face is still damp.
• Mist or toner: one or two layers of something watery, pressed in with your palms.
• Humectant serum: one layer of a serum built on glycerin or hyaluronic acid.
• Seal: a moisturizer within a minute or two, while the surface still feels slightly tacky. At night, add a thin layer of a balm on the driest areas if you need it.

The sealing step is where the formula matters. The 2016 review reports that petrolatum at a concentration of at least 5% reduces water loss by more than 98%, while lanolin, mineral oil and silicones reduce it by only 20 to 30%. You do not need petroleum jelly on your whole face, and the review notes its greasy feel puts many people off, but a cream with a real occlusive in it does more than a watery gel lotion as the final layer. If you are unsure where serums and creams fall, our guide to what order to put on skincare lays out the sequence.

Editor’s note

My most-used product is a creamy toner that I spray through a mist pump so I barely have to touch my face. I use it to layer moisture in hot weather and cold weather alike. When I lived in the UK, where it was cold outside and dry indoors, moisture came first, and I built it up in layers rather than trusting one product to do everything. In my routine, the mist is always followed by the lotion I got from my dermatologist.

When does skin flooding help most?

In cold, dry weather and heated rooms, when water leaves the skin fastest. A 2016 review of humidity and temperature concluded that low humidity and low temperatures lower the skin’s barrier function.

Indoor heating counts. In a 2023 Korean split-face study, women with normal skin spent at least 6 hours a day indoors with the heater on; after 6 hours, roughness and redness on the face had increased, and the side treated with a ceramide cream did better than the untreated side. Timing matters as well: the 2016 moisturizer review reports that a moisturizer’s effect peaks 30 minutes to 1 hour after application and usually lasts about 4 hours, and that only 50% of an applied cream remained on the skin surface after 8 hours. On long heated days, a second, lighter round at midday makes sense.

Who should skip skin flooding?

If your skin is oily, breakout-prone or easily irritated, scale it down rather than skipping hydration altogether. More layers mean more ingredients touching your skin, and the 2016 review lists odor, potential allergenicity and greasiness as the limiting factors of most occlusives. It also notes that facial skin is more sensitive than other body areas, possibly because it has fewer layers in its outer barrier.

For oily skin, one hydrating layer and a gel-cream is often enough. For reactive skin, choose fragrance-free products, change one layer at a time, and patch test anything new before it goes on your whole face. If your skin stings by the third layer, stop at two.

This article is for general cosmetic information and is not medical advice. If your skin is persistently dry, cracked or itchy, speak with a dermatologist.