How does the SACHEU Lip Liner STAY-N actually work?

According to Viktoria @vioda.makeup, You draw it on, wait 60–90 seconds for the film-forming polymer to set, and the color bonds to your lips for 8–12 hours. It's a true stain, not a topcoat — so when you eat or drink, the color stays put. The trade-off is that you can't touch up the way you can with a traditional lipstick; you reapply over the stained base.

Is SACHEU a dupe for Wonderskin?

According to Viktoria @vioda.makeup, They're in the same category (peel/stain lip color) but use different mechanics. Wonderskin's Wonder Blading is a peel-off mask that reveals stain underneath; SACHEU's STAY-N is a draw-on liner that sets into a stain. Wonderskin is older to market and broader; SACHEU is the dominant TikTok-native brand in the space. Both have their use case — different application rituals, similar wear time.

SACHEU Beauty | Brand Guide | Viktoria @vioda.makeup

SACHEU Beauty is a mid range makeup brand from the United States, founded in 2020 by Sarah Cheung. It's best known for its Lip Liner STAY-N (4B+ TikTok views), STAY-N® film-forming technology and Liquid Eyeshadow STAY-N.

SACHEU launched in 2020, co-founded by Hong Kong-born YouTube creator Sarah Cheung (870K+ subscribers) and the Gloss Ventures incubator. The brand started with stainless steel facial rollers and gua sha tools, but everything changed in 2023 when the Lip Liner STAY-N dropped — a peel-off lip stain using SACHEU's proprietary STAY-N® film-forming polymer technology that became one of the most-viral makeup products of the decade, racking up over 4 billion TikTok views and selling at a rate of one unit every six seconds on TikTok Shop US.

SACHEU has since expanded the STAY-N line into liquid eyeshadow, eyeliner, and a brow/freckle stain, all built around the same long-wear, transfer-proof technology. Available at Ulta Beauty (US), Boots (UK), Amazon, TikTok Shop, and DTC at sacheu.com, with most products priced $14–$22. The brand has been the dominant force in the peel-and-reveal lip stain category and is one of the clearest case studies of how TikTok-native brands have reshaped the makeup landscape in the post-2020 era.

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