Most artists know humidity matters.
The problem is that many don't actually know why.
When retention suddenly drops, stickies increase or adhesive starts behaving differently, the first instinct is often to blame the glue. In reality, the environment is usually the first place to look.
Understanding how humidity affects adhesive can completely change the way you troubleshoot retention issues.
Adhesive Doesn't Dry — It Cures
One of the biggest misconceptions in the lash industry is that adhesive "dries."
Lash adhesive doesn't dry in the traditional sense. Instead, it cures through a chemical reaction called polymerisation.
Cyanoacrylate, the primary ingredient in lash adhesive, reacts with moisture in the air. The moment the adhesive is exposed to humidity, this curing process begins.
This means the environment around you is constantly influencing how your adhesive performs.
What Happens In High Humidity?
When humidity rises, there is more moisture available in the air.
As a result, the adhesive cures faster.
At first this can feel beneficial. The glue appears quick and responsive. However, if the curing speed becomes faster than your placement speed, problems can begin.
You may notice:
Reduced working time
Difficulty adjusting placement
Increased brittleness in glue bond causing lashes to "pop off"
Lower retention despite proper technique
Adhesive behaving differently throughout the day
Many artists describe this as their glue suddenly feeling "too fast."
In reality, the glue hasn't changed. The environment has.
What Happens In Low Humidity?
Low humidity creates the opposite challenge.
With less moisture available, the adhesive cures more slowly.
This often leads to:
Increased stickies
Lash movement after placement
Poor attachment points
Inconsistent retention
Difficulty building speed
The adhesive may feel wetter for longer, creating opportunities for the extension to shift before the bond fully forms.
Why Retention Suffers
Retention problems are rarely caused by a single factor.
However, when the curing speed of the adhesive is mismatched with your technique, the bond can become compromised.
If adhesive cures before proper attachment occurs, the bond may be weak.
If adhesive cures too slowly, the extension may move before a secure bond develops.
Both scenarios can lead to premature shedding.
Pro Notes
In the Studio
If your glue suddenly feels too fast, check humidity before changing adhesives.
Many artists purchase multiple glues when the real issue is environmental control.
The GOAT for high humidity
A thinner adhesive bead is often easier to control in higher humidity because there is less product available to cure.
Inside The Set
Professional artists monitor trends, not individual bad days.
If retention changes across multiple clients, the room conditions are usually worth investigating before adjusting products.
Final Thoughts
Humidity is one of the most influential variables in lash application, yet it is often misunderstood.
The better you understand curing, the easier it becomes to identify the true cause of retention issues.
Great retention isn't just about finding the right adhesive.
It's about understanding the environment that adhesive is working in.