Lash lift processing times are system-specific. They should never be taken from a generic timing chart and applied to every product or every client. The correct timing depends on the professional lash lift system being used, the manufacturer's protocol and the condition and characteristics of the client's natural lashes.
For London Brow professionals, this is particularly important because London Speed-Lift and London LashFixx are different systems with different formulations and treatment protocols.
Why Lash Lift Processing Times Matter
Lash lifting chemically reshapes the natural lash hair. Correct processing is therefore an important part of professional treatment control. Processing for too little or too much time can affect the finished result and the condition of the natural lashes.
Technicians should assess the lashes before every treatment and work within the instructions for the exact system they are using.
London Speed-Lift Processing Times
The London Speed-Lift Lash Lifting System has its own defined professional timings:
- Step 1: 5–12 minutes, adjusted according to lash thickness.
- Step 2: 5 minutes.
- Step 3: 5 minutes.
These timings apply to London Speed-Lift. They should not automatically be transferred to another lash lift system.
For the full application method, technicians should use the London Speed-Lift step-by-step instructions.
Does Lash Thickness Affect Speed-Lift Processing?
Yes. London Speed-Lift Step 1 is specifically adjusted within the stated 5–12 minute range according to lash thickness. The technician should assess the client's natural lashes and follow the London Speed-Lift treatment protocol rather than selecting a time from a generic fine/normal/coarse chart.
Steps 2 and 3 have a stated processing time of 5 minutes within the London Speed-Lift system.
London LashFixx Processing Is Different
London LashFixx is a cysteamine-based professional lash lift system. It is a different formulation from London Speed-Lift and must be used according to its own professional processing and application guidance.
Do not apply London Speed-Lift timings, or generic timings taken from another brand or system, to LashFixx.
LashFixx requires professional lash-lift training, assessment of the natural lashes and adherence to the specified application and processing instructions. The full guidance is available through our professional brow and lash instruction guides.
Cysteamine vs Thioglycolate Lash Lift Systems
Different reducing agents and formulations behave differently, which is one reason processing times cannot be generalised across lash lift systems.
It is not appropriate to assume that every cysteamine system is automatically suitable for sensitive eyes, that every thioglycolate system processes at the same speed, or that one ingredient category alone determines the correct treatment time. The complete formulation and the manufacturer's tested protocol matter.
What Should Determine Lash Lift Processing Time?
A professional technician should consider:
- the exact lash lift system being used;
- the manufacturer's current instructions;
- the client's natural lash thickness and condition;
- previous chemical treatments and relevant treatment history;
- the system-specific application method; and
- the technician's professional training and treatment protocol.
Where a system provides a timing range, assessment of the lashes helps the trained technician work within that range. It does not justify exceeding the manufacturer's maximum processing time.
Should Room Temperature, Cling Film or Product Thickness Change the Timing?
Do not independently shorten or extend processing times because a room feels warmer or cooler, because occlusion has been used, or because more product has been applied, unless the instructions for that specific system explicitly tell you to do so.
Similarly, applying a thicker layer of lifting product should not be used as a technique for intentionally accelerating processing. Consistent application and adherence to the treatment protocol are more important than creating unofficial timing rules.
Can You Use Cling Film During a Lash Lift?
Only use occlusion or cling film where it forms part of the instructions for the professional system and technique you are following. London Brow sells professional lash lift cling wrap, but its use should still follow the relevant treatment protocol rather than being treated as a reason to invent a shorter processing time.
Professional Lash Assessment Before Processing
Before beginning a lash lift, assess whether the natural lashes are suitable for treatment. Damaged, excessively weakened or otherwise unsuitable lashes should not simply be given a shorter processing time as a workaround.
Complete the required consultation and patch testing, follow the contraindications for the system, and keep appropriate treatment records.
Why Generic Lash Lift Timing Charts Can Be Misleading
Online advice sometimes suggests universal timings such as a set number of minutes for “fine”, “normal” or “coarse” lashes. These figures can be misleading because two lash lift products may use different formulations and have completely different tested protocols.
The safest professional reference is therefore the current instruction guide supplied for the exact product being used.
Lash Lift Processing FAQs
What are the processing times for London Speed-Lift?
London Speed-Lift Step 1 is processed for 5–12 minutes according to lash thickness. Steps 2 and 3 are each processed for 5 minutes. Follow the full Speed-Lift instructions for application and treatment technique.
Can I use the same timings for LashFixx?
No. LashFixx is a separate cysteamine-based system and must be used according to the LashFixx professional instructions.
Should I add extra processing time for resistant lashes?
Only work within the processing guidance supplied for the specific system. Do not exceed the manufacturer's recommended maximum simply because lashes appear resistant.
Can I reduce processing time when using cling film?
Do not create your own timing adjustment. Follow the instructions for the exact system and technique being used.
Are cysteamine lash lifts always gentler?
Cysteamine is a different reducing agent from thioglycolate, but treatment suitability and performance depend on the complete formulation, the client's lashes and correct professional use. Avoid making universal safety or suitability assumptions based on one ingredient alone.
Professional Lash Lift Products and Training
London Brow offers professional lash lift systems and products alongside professional lash training.
Whichever system you use, the key rule is simple: use the timings tested for that system, assess the client's lashes and follow your professional protocol.