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Flexie Eyelash Extension Glue




Experience Level



Extremely Strong 

Drying time

1 second

Room humidity


Room temperature



thin, medium, syrup like

syrup like


Flexie eyelash extensions adhesive / lash glue:
  • best eyelash extension glue for the low humidity conditions.
  • suitable for Classic lashes as well as Russian Volume lashes. 
  • the velvety consistency allows you to pick the ideal amount of glue
  • glue stays flexible even when it's completely polymerised, giving a great retention
  • extremely fast-drying (1 sec) - NOT SUITABLE FOR BEGINNERS AND INTERMEDIATE lash technicians who have performed fewer than 1000-1500 lash sets


    We highly recommend that you try a sample first before purchasing the full-size glue bottle. The adhesive in a sample-size bottle can only be used for up to 5 days after opening (if stored correctly in a cool and dry place, away from direct sunlight). 

    The glue for semi-permanent eyelash extensions is for professional use only. 

    Please note that during Black Friday, the maximum purchase of glue per order is 20 pieces. If you would like to order in bulk please contact our customer service team at Please note that all online orders with over 20 pieces will be required to be amended before checkout.

    How to use

    How to get the best retention using Flexie?

    The best temperature for Flexie glue is 18-22°C (64.4 - 71.6°F) with perfect humidity conditions being 40-70%. Please remember that if your:

    • Temperature is lower than 18°C (64.4°F), Flexie may be drying slower
    • Temperature is higher than 22°C (71.6°F) , Flexie may be drying quicker
    • Humidity is lower than 40%, Flexie may be drying slower
    • Humidity is higher than 70%, Flexie may be drying quicker 

    Working in the perfect glue conditions will ensure its drying time is on point, resulting in great retention. To monitor your room conditions, we recommend using a hygrometer. The easiest way to adjust the temperature in your lash room is to use an Air Conditioner, fan or heater/radiator, and to increase or decrease the humidity, use a humidifier or dehumidifier. 

    Remember that incorrect work with fast-drying adhesive can cause poor retention. If your room has high humidity and temperature, your glue will dry much faster. But since the speed of your work is not increasing accordingly, you might experience poor attachment causing extensions to “brush off” at the end of the treatment OR fall off the natural lashes within the next 2-3 days after the treatment. 

    Your retention may also be affected if your adhesive is not fresh or you store or use your glue incorrectly. 

    The shelf life of full size Flexie before opening is 6 months from the date of production and for the sample it’s 3 months. After opening, we recommend changing your glue bottle every 4 weeks for the best retention. If you use the sample bottle, you need to change it every 5-7 days.  Please remember to store your glue in the upright position, in a dry place, away from direct sunlight, ideally in an airtight container

    To keep an eye on the freshness of your glue, simply stick a piece of tape with a written date of the glue opening onto your adhesive bottle. When shaking the glue, remove the lid and cover the nozzle with a folded in half glue nozzle wipe. Remember to wipe the nozzle after every use of the glue to prevent the nozzle getting stuck into the cap .  


     If you notice that your retention is not perfect, please go through this checklist:

    • Adjust  the level of humidity and/or temperature in the room to the recommended levels.
    • Check if you clean natural lashes properly - we recommend using Lash Foam cleanser to clean the eye area from any dust, oils or makeup (make sure to rinse it well before lash application!) AND/OR protein remover pads (removes traces of makeup and oils). After a thorough cleaning process and applying eyepatches, prepare natural lashes using cleanser (removes any remaining oils), followed by primer (hydrates and neutralizes PH level).
    • For even better results, use Retention & Speed Booster as a last preparation step to open hair cuticles and enable the glue to bond better with a natural lash.
    • For those clients who “play” with their lashes and sleep with their “face in the pillow” - use Retention Superbonder as the last step of your application procedure. SuperBonder cures the glue faster and makes the glue texture more flexible and less likely “to snap off” the natural lashes.
    • Check if your professional eyelash glue bottle is still fresh.
    • Make sure you ALWAYS work with a fresh glue drop (we recommend changing a glue drop every 10-20 minutes - or even more frequently during the hot months).
    • Make sure you pick up a good amount of glue - a too small bead that is not visible or a very thin layer of adhesive might not be enough to hold the extension on the natural lash during the next few weeks. Consider that most of your clients might sleep with their face in the pillow and “play” with their eyelashes. 
    • Check if your attachment is correct (at least 2mm attachment with the natural lashes,  no split or criss-crossed bases).
    • The glue drop used should be neither too large (the greater the surface, the more the adhesive will come into contact with the air), nor too small (the glue drop will dry too fast).
    • Do not add fresh glue onto the previous drop of the glue (the contact between the "old" and the "new" drop will make the glue ‘gloopy’ very quickly).
    • If none of the above is working - switch to slightly slower drying adhesive (for example Lady Bond  or consider booking a training or a mentoring session with one of London Lash Approved Trainers - Search Here. 

    The glue for eyelash extensions is for professional use only.

    Product properties

    Cruelty-free Gluten-free Heat-resistant Latex-free Vegan
    Queens Award 2020
    London Lash are proud winners of the Queen's Award 2020

    Customer Reviews

    Based on 244 reviews

    Best glue with the best retention


    This glue is hands down the easiest, fastest and most cooperative glue ive used. It dries quickly when paired with the booster! I dont think ill ever be going back to a different glue 🫶🏼

    Rebecca cross
    Best glue ever!!!!

    I’ve used a lot of different glues and have finally stopped at flexi. I used for my Russian fans and it’s amazing. I’ve even subscribed to it over a year ago and I won’t be changing

    What’s going wrong.

    Been buying this glue for a while but the last 2 bottles I’ve bought seem to not have a 1 second drying time - it’s deffo longer. and so I end up with loads of stickies, which is slowing me down a lot. The room humidity is well within the allowance and the room temp is always around 20 degrees so I’m not sure what’s been going wrong. 🤔

    Hi Lianna,

    We're so sorry to hear you've had some trouble with our Flexie adhesive!

    Usually if an adhesive is taking too long to dry, we'd advise to take a look at two key factors:
    1) Freshness of the glue (how long have you had it open and when was the DOP)
    2) Are your humidity/room temperature slightly lower than usual?

    As you mention your room conditions are the same, we'd first look at how fresh your glue is!

    We'd love to help you resolve this, so we're going to reach out to see how we can help

    Lots of love,
    Team LLP x


    I tried many glues before but hands down this is the best on the market so far .. i was having troubles with stickiness and retention but this glue saved mee !!

    I will stick with this glue for the rest of my life :))

    Thank you London lash pro I’m truly satisfied 💖