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What Is Humidity — And How Is It Relative to Lash Adhesive?

Let’s break it down.

💧 What Is Humidity?

Humidity is the amount of water vapor (moisture) in the air. But when we talk about it in lashing, we’re usually referring to relative humidity (RH) — the percentage of moisture in the air compared to how much it could hold at a certain temperature.

So when you see “45% humidity” on your hygrometer, that means the air is holding 45% of the total moisture it’s capable of holding at that temperature.

🧪 Why Does It Matter for Lash Adhesive?

Lash adhesive (which is usually cyanoacrylate-based) doesn’t dry with air — it cures when it comes into contact with moisture. That means humidity directly controls how fast or slow your glue sets.

🔹 Low humidity = not enough moisture in the air

➡️ Adhesive cures slower, may stay wet too long➡️ Risk of lashes shifting, poor bonds, weak retention

🔹 High humidity = too much moisture in the air

➡️ Adhesive cures too fast, sometimes before you place the extension➡️ Can cause brittle bonds, “shock curing,” or early fallout

🎯 So What’s the Ideal Range?

Most lash adhesives perform best in:

  • Humidity: 40–60%

  • Temperature: 68–74°F

If you're outside that range, your adhesive might not work as expected — even if it’s brand new.

📌 The Bottom Line

Humidity is everything in lashing. It affects your glue's behavior, your application speed, your client’s retention — everything.

Always use a hygrometer to monitor your room, and make sure your environment matches your adhesive’s sweet spot.

 
 
 

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