I’ve tested my fair share of liquid liners, and I can usually tell within the first swipe whether something’s going to be a daily staple or a one-and-done. The 3650 Liquid Eyeliner from Rei Cosmetics? Immediate yes.
The application is smooth with a brush tip that is incredibly fine, making it easy to create anything from a barely-there lash enhancement to a sharp, dramatic wing. I’m not the steadiest when it comes to eyeliner, but this one practically does the work for me. The control comes down to the unique octagonal grip. It might sound like a small detail, but it actually makes a huge difference. It feels secure in your hand and gives you that extra bit of precision.
Formula-wise, this liner is ultra-pigmented, so you get a deep, rich black in just one pass. It also dries fast; no worrying about blinking too soon or transferring onto my lid. Once it sets, it stays.
You can wear it through a full day without smudging, flaking, fading, etc. If you need your eyeliner to last from morning to night, this one is great and at a great price point ($15). It’s waterproof and holds up throughout the day, but somehow still removes easily with warm water and cleanser.
Another standout is the brush itself, which is crafted with a blend of different hairs for a softer, more precise application. It feels gentle on the eyes with no tugging or irritation, which is key if you have sensitive skin.
Rei Cosmetics, the NYC-based, women-owned retailer behind this find, is all about making Japanese beauty more accessible in the U.S. Founded by Nami Soejima and Chiaki Honda, the brand curates high-quality skincare, makeup, and haircare known for innovation and everyday ease, sourcing directly from Japan to ensure authenticity.
