The eyelash glue takes 24 hours to fully cure and needs the environment to be correct to do this. It’s a chemical reaction with moisture in the air. If it’s an extremely warm day the glue can cure too quickly causing the adhesive not to perform correctly. The Cyanoacrylate based glue becomes brittle as the chemical reaction hardens it too quickly causing the extensions to bing off the following day. If you live in a hot country I would advise investing in air-con.

The humidity also plays an important part in this. If it’s too humid (over 55%) then the glue cures too quickly often called ‘boom’ and turns the glue white, if it’s too dry (under 45%) the reaction is too slow. Check with a hygrometer and adjust the room’s humidity with a humidifier or dehumidifier.

45 – 55 % humidity, and 20 – 22 degrees Celsius


The glue is dry within 3-4 seconds due to the small amount used in bonding eyelash extensions to natural lashes. This varies slightly from glue to glue. Just remember that the glue isn’t fully hardened until 24 hours, so remember to tell your clients no saunas or hot yoga after their treatment! I always give my clients an A4 sheet of aftercare to follow.


Sometimes in extremely warm weather, it really is best to reschedule your client’s appointment.

Not just the beauty salons!

Having a chat with a hairdresser this week they have spoken about closing the salon for hair colouring and just doing cuts, as the colour is taking too quickly and the processing time is too unpredictable for the correct result.