How to tell if your eyelash extension glue has gone bad

Why does it matter?

One of the most common situations for lash artists:
Yesterday the glue worked perfectly — today it suddenly behaves differently, cures too fast or gives poor retention.

Many start looking for the problem in their technique, humidity, or even the client.
But often the reason is much simpler: the glue has lost its properties.

If unnoticed, this leads to:
poor retention, liftings, and unhappy clients.

EXP or MFD: what do these labels mean?

On the glue bottle you may see different markings:

• EXP (Expiry date) — expiration date
• MFD (Manufactured date) — production date

Important:
The shelf life of the glue is calculated from the production date, not from the purchase date.

Shelf life: unopened vs opened

• Unopened — up to 6 months from production date
• After opening:
  • up to 2 months in winter
  • up to 1.5 months in summer

Temperature, humidity, and air exposure directly affect the glue’s composition.
Once opened, it gradually starts losing its performance.

Tip:
Write the opening date directly on the bottle — this helps you stay in control.

Can you tell by the smell?

Short answer: no.

Smell is not a reliable indicator.
Even expired glue can still smell “normal”.

3 signs your glue has gone bad

Besides the expiration date, there are clear signs you’ll notice during work:

1. Consistency
The glue becomes stringy and thick — a sign the formula has changed.

2. Faster curing time
The glue cures too quickly and becomes unstable.
You don’t have enough time to place the extension properly.

3. Uneven color
Even after shaking, the glue doesn’t mix well anymore — the components are separating.

If you notice any of these signs, the glue is no longer suitable for lash extensions.

What happens if you keep using it?

• Poor adhesion
• Increased liftings
• Reduced retention
• More difficult and unpredictable work

The biggest issue:
You may think your technique is the problem — while it’s actually the glue.

Common mistake: buying glue in bulk

Especially during sales, many lash artists stock up.

However, glue has a limited lifespan, and often not all bottles are used in time.

Result: wasted money and inconsistent results.

Conclusion

Fresh glue is the foundation of stable work and long-lasting results.

To avoid problems:

• always check the production date
• monitor shelf life after opening
• observe how the glue behaves
• follow proper storage rules

And most importantly:
never compromise on freshness.