I spoke at Opal Conference on Saturday, and I've had more messages about it since than anything else I've ever presented. So here it is written down, for everyone who was in the room and wants it in front of them, and for everyone who wasn't.
A few years ago I gave a talk called It's not your glue, it's you. It annoyed some people. It also started more conversations than anything else I've done. I wanted to come back to it, partly because I still believe every word — and partly because something has changed since then.
UV adhesive. Cure it with a light, eight weeks of retention, humidity stops mattering, no more waiting. It's on every supplier's stand and all over social media, and the question I've been asked more than any other this year is:
Is UV glue the thing that finally changes my retention?
I'll answer that properly. But I can't answer it until we go back over the first half, because you cannot judge whether a new adhesive will fix your retention until you understand what retention actually is.
One thing first, same as I said on the day: I'm looking at this category for my own brand. I'd rather tell you that upfront than have you find out later.
Let's start with the thing that decides everything.
Your client's natural lashes aren't permanent. Every one of them is on a growth cycle — it grows, it stops, it rests, it sheds. Depending on the lash and the person, that whole cycle runs somewhere in the region of four to eleven weeks.
Which means a natural lash that was already halfway through its cycle on the day you worked on it is going to shed. Not because of your glue. Not because of your fan. Because it was always going to.
So when a client tells you her lashes "fell out early", what usually happened is that her natural lashes did exactly what natural lashes do. They just did it with something attached.
Every lash you work on is already on a clock. And you didn't start it.
There's no adhesive on this planet — cyanoacrylate, UV, hybrid, or whatever comes next — that can hold an extension onto a lash that is no longer there.
So what does "up to eight weeks" actually mean?
This is worth being fair about, because I don't think those numbers are dishonest.
When you see up to eight weeks on a stand, that isn't a lie. But it isn't a promise either. It's a best case — what that adhesive can do on a lash at the start of its cycle, applied properly, in the conditions the adhesive was designed for. It's the top of the range, not the average.
Put that same adhesive on a lash that's already three-quarters of the way through its life and it will do exactly what it was always going to do, which is shed. Not because the glue underperformed. Because the lash ran out.
A better lash glue doesn't give you more time. It stops you losing the time you already had.
So the real question isn't which lash glue gives me the longest retention. It's: am I getting everything that lash was ever going to give me — and if not, what's taking it off me?
A bit of chemistry, and I promise it's the useful kind.
Cyanoacrylate doesn't dry. There's no solvent evaporating off. It polymerises — the molecules link into chains, and those chains are your bond.
And what triggers it? Water. Moisture in the air. The humidity in your room isn't a comfort setting, it's the ignition switch. Without moisture, that reaction doesn't start properly.
Which is why humidity causes so much grief, and why it does it in two completely opposite directions.
Too dry and the reaction is sluggish. The adhesive sits wet on the lash for longer than you think. It moves, it migrates, it wicks up the extension, and you end up with a bond that never properly hardened.
Too humid and you get the opposite problem, which is more interesting. The surface of that dot cures almost instantly — sometimes before you've even placed it properly. You get a shell. Hard outside, still soft underneath. It looks bonded. It behaves bonded on the day. Then it shears off in week two and everybody blames the glue.
That white, frosty look — blooming, shock polymerisation — is the same thing. That's adhesive curing in the air before it ever got where it was going.
Two things that go together
The bond happens at the interface. It's the contact between the adhesive and the surface of the natural lash. It is not the volume of glue you put on.
More glue does not mean more bond. A bigger dot gives you a bigger core of slow-curing material that holds moisture, cures unevenly, adds weight, and eventually fails.
So retention isn't about how much glue you use. It's about how much of that extension is genuinely in contact with the natural lash.
Which is another way of saying it's about your attachment, your wrap, your placement, your isolation.
Which is another way of saying — sorry — it's you.
The four things that are actually you
Four levers. In order of what they cost, which is roughly nothing.
Prep
The natural lash has a lipid layer on it. Oil, sebum, makeup residue, skincare that's migrated up overnight. And you're trying to bond to it.
If there's a film between your adhesive and the lash, you don't have a bond. You have adhesive stuck to a layer of oil that's stuck to a lash. That fails around week two, and it looks exactly like an adhesive problem.
Cleansing is the highest-return thing on this list, and it's the thing most commonly rushed at 8am when you're running behind.
Environment
Know your numbers, in your room, not on the bottle. A hygrometer costs less than a coffee. Buy one and actually look at it.
And here's the part people miss: your room isn't one environment. Heating on in the morning, four clients' worth of breath and body heat by three o'clock, a window open in summer. If your adhesive behaves differently at 9am and 4pm, that's not the glue being inconsistent. That's the room.
Attachment
Surface contact. Wrap. Placement distance from the lid. Isolation that's genuinely clean, not nearly clean.
And here's the one diagnostic I'd want everyone to take away. At a two-week top-up, look at what's actually failed:
- Are the extensions coming off with a natural lash still attached? That's the growth cycle. That's biology. That's fine.
- Are they coming off bare, leaving the natural lash behind? That's a bond failure. That one's yours.
That single check will tell you more about your work than any glue you ever buy.
Aftercare
Your bond keeps curing after the client leaves. It isn't at full strength when she walks out the door — it builds for the next day or so. And in that window, everything she does matters.
You can do a technically perfect set and lose it to a client who scrubs her eyes with a flannel every night.
None of those four are on a shelf. All of them are free.
UV glue? Now we can have the conversation properly.
And I want to set the terms first, because this gets shouty online and I'm not interested in that. I'm assuming we're talking about a well-made product from a proper manufacturer. I'm not here to tell you it's dangerous. I'm here to explain what it actually does — because I don't think many people have, and you can't judge whether something suits your work until you understand how it behaves.
So let's put the two systems side by side.
What triggers the cure
The adhesive you're using now is triggered by moisture.
A UV or LED system is triggered by light. There's an ingredient in the formula that absorbs light at a particular wavelength, and when it does, the reaction starts. No light, no cure.
That's the entire difference. Everything else follows from it.
Who's in charge of the timing
With your current eyelash adhesive, the room decides when the cure starts. The moment that dot is out in the air, it has begun. You didn't choose the timing — the weather chose it, your radiator chose it, the four clients you've already had in today chose it.
With a light-cured system, you decide. The adhesive stays workable until you point a light at it.
Think about what that changes. Right now, everything you do is a race against a reaction that's already running. With a light-cured system, you place it, you look at it, you adjust it, and then you commit.
That's a different way of working. Not automatically better — different. Some artists will love it. Others will find the extra step breaks their rhythm, because you're now adding a cure to every placement rather than working continuously.
When the bond reaches full strength
Your current eyelash adhesive isn't finished when the client sits up. It keeps building for the next day or so, which is why the aftercare window matters.
Now — some of you are already thinking but I use a bonder, our FusionLock. Good. Let's talk about that, because it's the bit of this comparison people skip.
A bonder or sealant works on eyelash adhesive still unreacted inside your bond and helps it finish there and then, rather than slowly overnight. So it's already closing part of the gap. If you use one properly, you're not starting from the same place as someone who doesn't.
But — honestly — it works on the bond you gave it. It finishes what's there. It cannot reach into a bond that never had proper contact in the first place, and it doesn't put adhesive where you didn't put any. It's a finisher, not a rescue.
And it doesn't buy you a different aftercare conversation, because most of what we ask clients to avoid on day one isn't really about cure time. It's about not soaking, rubbing and stressing a brand new set while she's still getting used to it.
So when someone tells you a light-cured system means the bond is ready instantly — that's true, and it's a real difference. Just know it's a difference from not using a bonder. Against a properly bonded set, the gap is narrower than the marketing suggests.
Where each one fails
Both systems can go wrong. They just go wrong in different places, and knowing which is which is what makes you good at this.
With your current adhesive, the failures come from timing and environment. The wrong humidity. A dot that shocked. A bond that cured hard outside with a soft middle.
With a light-cured system, the failure is about whether the light got there. The reaction needs light at the bond. And you're working in a dense set, with lashes shadowing each other, curing from one direction.
So the question I'd want answered before I changed anything about my work is simply: does the light reach every bond?
What happens to the bonds the light missed
Here's the useful bit, and it's more reassuring than people expect.
Most of these systems aren't purely light-cured — there's still cyanoacrylate in there. So a bond the light missed isn't ruined. It falls back on the old method: moisture in the air gets to it eventually and it cures the slow way, exactly like your current eyelash adhesive does.
Which sounds fine. And mostly it is. But think about what you've actually got sitting on that eye.
Some of those bonds are hard and finished the second you lit them. And some are quietly curing overnight at the mercy of your room — which is the exact thing you bought the system to get away from.
You've got one set of lashes cured two different ways.
And that's what makes it hard to troubleshoot. Retention comes back patchy. Not bad — patchy. Lovely in places, disappointing in others, same client, same appointment, and nothing in your process looks wrong. That's much harder to spot than a set that simply doesn't hold.
The other practical thing: adhesive that's still soft underneath can still move. That's where your stickies and your migration come from.
None of that is a reason not to use it. It's a reason to learn to use it properly. Cure from more than one angle. Give it the time the manufacturer actually states rather than a confident wave of the lamp.
So the honest answer is that it depends on your lamp, your wavelength, your angle, your hold time, and how dense the set is. Which means with this system, your technique with the light becomes part of your technique full stop. It's a new skill. You'd need to actually learn it, not assume it.
And what it doesn't change
It doesn't give you more time than the natural lash has. That lash is still on its own clock and it will shed exactly when it was always going to shed.
The same best-case rule applies to the numbers on a UV stand as to any other stand. Eight weeks means young lash, good application, right conditions. It's telling you what the product is capable of, not what every client will get — and that was true of your current adhesive long before UV existed.
And it doesn't fix your prep. It doesn't fix your attachment. It doesn't fix a client who scrubs her eyes.
So — will the UV system save you?
It solves an environment problem. It does not solve a technique problem.
If your retention is inconsistent because your room is inconsistent, this is genuinely interesting technology and you should look at it properly.
But if your retention is inconsistent because of what's happening between the extension and the natural lash, you'll just be curing a poor bond faster.
Which, again, brings us back to you.
What I'd like you to take from this
Every lash your client has is on a clock, and nothing in a bottle slows it down.
Everything between what you're getting now and what that lash was always going to give you — that's prep, environment, attachment and aftercare. All four are free. All four are yours.
And when something new arrives, whether that's UV or whatever comes after it, the question is never will this fix my retention. It's what problem does this actually solve, and is that the problem I've got?
Because the technology will keep changing, and the marketing will keep promising, and the natural lash will keep shedding on exactly the same schedule it always has.
It's still not your glue.
Thank you to Opal Conference for having me, and to everyone who came and found me afterwards to carry on the argument. Those conversations are the reason I say yes to these things.
Arune Mooney ♥️