Who says lash extensions are only about lashes and adhesive? To achieve bold, voluminous results, lash artists rely on more than just the basics—they need the right support products at every stage: before, during, and after application.

In the world of pre-treatment essentials, two products are creating serious buzz: Lash Primer and Protein Remover. But what do they actually do? And why are both considered must-haves for flawless prep work?

While they serve different purposes, neither is optional—each plays a powerful role in setting the stage for long-lasting, beautiful lashes.

Two Products, Two Key Roles in Lash Extensions Pre-Treatment

Think of it like removing heavy makeup. Even after using a makeup remover, oil cleanser, and face wash, your skin often doesn’t feel completely clean—especially on full-glam days. Mascara still clings to your lashes, foundation lingers deep in your pores, and your skin feels dry or stripped. Without following up with the right products, your skin can quickly run into issues.

The same applies to your client’s lashes. The lash line is an oil-prone area that needs extra attention. Even after cleansing with lash shampoo, residue and natural oils can still remain. That’s where Protein Remover and Lash Primer come in—your pre-treatment heroes. They go beyond surface-level cleaning to deeply prep the natural lashes, rebalance moisture, and create the perfect base for stronger, longer-lasting lash extensions.

Stop the Confusion — Understand the Formula Difference

At first glance, Lash Primer and Protein Remover might seem nearly identical. Both are clear, water-based liquids with a thin, watery texture. But don’t let appearances fool you—their formulas and functions are completely different.

What’s in a Lash Primer?

Lash Primer is formulated to prep natural lashes for maximum retention and bonding. Its key ingredients include:

• Di-water

• Ethyl Alcohol – Dissolves oils and impurities on the lash surface, creating a perfectly clean base for glue to bond. Much like its role in skincare and makeup, it enhances adhesion and prolongs product wear.

• Acetic Anhydride – Balances the pH of the natural lashes and surrounding skin. A stable pH ensures your lash adhesive cures properly and lasts longer.

• Silane – Acts like a primer for lashes. It binds to the natural lash surface, improves tension, and strengthens overall glue retention.

Together, these ingredients help create the ideal bonding environment for seamless, long-lasting lash extensions.

What’s in a Protein Remover?

Protein Remover is designed for deep cleansing of the natural lashes—specifically targeting built-up oil, dirt, and protein residue. Its key ingredients include:

• Water

• Alcohol

• Propylene Glycol – A solvent that boosts the penetration and performance of cleansing agents, helping to lift away debris trapped in the lash line.

• Green Tea Leaf Extract & Allantoin – Soothing agents that calm the skin while supporting healthy lash follicles.

• Disodium EDTA – A chelating agent that neutralizes metal ions to prevent irritation and maintain cleaning effectiveness.

• Phenoxyethanol & Methylparaben – Preservatives that ensure product safety and shelf life.

• Fragrance, CI 19140, CI 42090 – Mild cosmetic colorants and scent.

Because of this gentle yet effective formula, Lii Clean Pro – Lash Protein Remover is suitable for all skin types, including sensitive skin.

So yes, both are lash prep essentials—but with different ingredients, they serve very different purposes.

Use the Right Prep for the Right Purpose

Both Lash Primer and Protein Remover are key players in the lash extension pre-treatment process. While they share the goal of thoroughly cleaning the natural lashes before application, they target different concerns.

Lash Primer is designed to remove excess oil and dirt, adjust the lash and skin pH, and form a chemical bond on the lash surface. This creates an ideal foundation for better adhesion and a stronger glue bond.

On the other hand, Protein Remover focuses specifically on eliminating protein buildup and stubborn residue that can interfere with proper bonding. Its degreasing effect penetrates deep to clean the lashes thoroughly, helping to prevent anything that could weaken retention.

So, while they work differently, both serve one essential purpose: to support better lash retention for longer-lasting extensions. Primer builds the bond. Protein Remover clears the way.

Not One. Not the Other. You Need Both.

It’s not accurate to say that Lash Primer can replace Protein Remover, or vice versa. Each serves a distinct yet complementary role in the lash extension process—and both are essential for optimal retention.

Take Lii Clean Pro—Lash Protein Remover: it’s best used before a new lash set or after removing old extensions to eliminate stubborn impurities that have built up over time. After cleansing with lash foam or eyelash shampoo, protein remover helps clear away protein buildup, debris, and excess oil, ensuring a fresh, clean lash surface.

That’s when Lii Pure Primer steps in. Also used before applying extensions, the primer follows the protein remover in the routine. It works to rebalance the lash pH and maximize adhesive bonding on the freshly prepped lash surface—setting the stage for strong, long-lasting extensions.

To prep like a pro, Lii Lash recommends using this dynamic duo—Protein Remover and Primer—together for maximum retention and flawless results. Paired with your other pre-treatment essentials, this combo lays the perfect foundation for every stunning lash set. Once you master this secret to long-lasting extensions, you’re not just creating beautiful lashes—you’re winning your clients’ hearts, time and time again.