How to Do Lash Fills: A Step-by-Step Guide to Flawless Results
Lash fills are the appointments that build your business—they keep clients looking good and coming back regularly. But here's the thing: a rushed or sloppy fill shows, and clients notice. Let's go through exactly how to do a lash fill properly, covering everything from your initial assessment to aftercare instructions.
What Are Lash Fills and When Do Clients Need Them?
A lash refill is a maintenance appointment where you replace extensions that have shed with the natural lash growth cycle. Unlike a full-set application where you start on bare lashes, fills work with existing eyelash extensions to restore fullness and shape.
0,03MM Kaschmir Premium Mega Volumen Wimpernverlängerungen
Curl: C
Länge: Mix8-15mm
The Fill Timeline:
- Clients typically need fills every 2-3 weeks based on the natural lash growth cycle, which means they're losing a few lashes daily.
- A fill is appropriate when clients still have 40-50% of their original extensions intact with the overall shape still visible.
- Recommend a full set instead when less than 40% remains, when clients wait 4+ weeks between appointments, or when existing eyelash extensions are in poor condition.
| Service Type | When to Recommend | Typical Timeline | Extension Coverage |
| Lash Fill | Extensions are still intact and well-maintained | Every 2-3 weeks | 40-50% or more remaining |
| Full Set | Too much time has passed or poor retention | 4+ weeks or first-time client | Less than 40% remaining |
Getting this assessment right from the start saves you time and sets proper client expectations.
Step 1: Check Your Client's Lashes and Talk Through Their Care Routine
Start by taking a close look at your client's eye health and their current lash extensions. This quick conversation helps you spot potential issues and plan your approach.
- Ask if they've experienced any eye irritation, allergies, infections, or started using new skincare products since their last visit—these can all affect how well the extensions hold.
- Find out about their daily habits: Are they cleaning their lashes regularly? Do they sleep on their face? Are they using any oil-based products around their eyes?
- Look at how many extensions are still attached, check if they're sitting properly, and spot any that are twisted, overgrown, or damaged.
- Make a mental note of which extensions need to come off (anything sitting 3-4mm away from the lash line, twisted ones, or poorly attached extensions) and which can stay.
This quick assessment only takes a few minutes but gives you a clear picture of what you're working with and helps you understand any common causes of poor retention.
Step 2: Thoroughly Clean and Prep the Lashes
Properly cleaned lashes are everything when it comes to making extensions last. Rushing through this step is the biggest reason fills fall out too soon.
- Use a lash-safe cleanser and a soft brush to gently clean from base to tip, removing oils, leftover makeup, dust, and dead skin.
- Focus extra attention on the lash line where buildup tends to collect—this buildup can stop the glue from sticking properly.
- After cleansing, apply lash primer to remove any last traces of oil and balance the pH so your adhesive bonds at its best.
- Use your air blower to make sure the lashes are completely dry before you begin applying extensions—even a little moisture will mess with how the glue sets and holds.
Even the highest quality adhesive won't stick to oily or dirty lashes, so don't skip or rush this step if you want the extensions to last.
Farbe: Weiss
Step 3: Gently Remove Old and Damaged Extensions
Taking off the problem extensions gives you a fresh canvas to work with. This step needs a careful touch and good judgment to keep the natural lashes healthy.
- Remove any extensions that have grown out more than 3-4mm from the lash line, ones that are twisted or pointing the wrong way, and any that are damaged or barely hanging on.
- For extensions that are already loose, use your isolation tweezers to gently slide them off—hold the natural lash steady and grip the extension near the base.
- For extensions that are still firmly stuck but need to come off, apply gel or cream remover right on the glue bond, wait 30-60 seconds, then gently remove with no pulling.
- Never yank or tug on extensions—if you feel any resistance at all, add more remover and wait a bit longer.
Starting with this clean foundation means your new extensions will have the best chance of lasting.
Step 4: Add New Extensions to Restore Fullness
Now you're bringing back the look your client fell in love with. Staying consistent with your products and technique is what makes fills look natural and seamless.
- Look back at your client's chart or photos to recreate the original design—the same curls, lengths, and overall style.
- Choose extensions that match what's already there so the new ones blend in perfectly with the existing lashes.
- Isolate each natural lash properly, place the extension 0.5-1mm from the lash line, and use just the right amount of adhesive for a secure hold.
- Keep checking both eyes for balance and fullness as you go, making little adjustments along the way instead of trying to fix everything at the end.
You want the fill to be invisible—your client should see beautifully refreshed lashes, not a mix of obvious new and old extensions.
Step 5: Seal Everything and Do a Final Check
These final touches are what turn a good fill into a great one. A careful quality check catches any problems before your client walks out the door.
- Apply bonder to the base of the lashes once all extensions are in place—this helps the adhesive cure faster and creates strong, flexible bonds that last longer.
- Test the adhesion by gently checking each section with your tweezers to make sure everything is secure and placed correctly.
- Step back and look at both eyes from a normal viewing distance to confirm they match in length, curl, and fullness.
- Check for "stickies" (extensions accidentally glued together) and carefully separate them—these are uncomfortable and can damage the natural lashes.
- Take photos and write notes about what products, lengths, and curls you used, plus any special requests to remember for next time.
A systematic final check ensures your client leaves with comfortable, gorgeous lashes that will hold up until their next appointment.
| Final Check Item | What to Look For | Why It Matters |
| Adhesion | Secure bonds, proper placement | Prevents premature shedding |
| Symmetry | Both eyes match | Professional appearance |
| Comfort | No poking, proper direction | Client satisfaction |
| Stickies | No extensions glued together | Prevents lash damage |
A systematic final check ensures your client leaves with comfortable, beautiful lashes that will last.
Post-Fill Client Education and Lash Extension Aftercare
Proper eyelash extension aftercare education is what keeps clients looking good until their next appointment. Take 60 seconds to review this every time, even with regulars.
Essential Aftercare Instructions:
- Keep lashes dry for 4-6 hours after the appointment while adhesive fully cures—no steam, showers on the face, or sweating at the gym.
- Clean lashes daily using a lash-safe cleanser with a soft brush, gently working from base to tip, then rinse and pat dry before brushing into place.
- Avoid oil-based products near the eye area, rubbing or pulling lashes, sleeping face-down, mascara, and hot steam or saunas for 24-48 hours.
- Schedule the next fill appointment for 2-3 weeks out before leaving, as timing matters for maintaining fullness and avoiding the need for a full set.
How to Clean Lash Extensions at Home:
- Use only lash-safe, oil-free cleanser with a soft brush or clean spoolie.
- Gently brush through lashes from base to tip to remove buildup.
- Rinse thoroughly with water and pat dry with a lint-free cloth.
- Brush lashes into place with a clean spoolie daily.
The difference between clients who return every 3 weeks and those who disappear? Usually it's education. Set them up for success with clear instructions and they'll reward you with loyalty.
Build a Thriving Business with Professional Lash Fill Techniques
Getting lash fills right isn't complicated—it just takes a solid process and patience. Clean thoroughly, remove damaged extensions carefully, apply with precision, and always finish with a quality check. When you nail these basics consistently, your clients will notice the difference in how long their lashes last. Put these steps into practice at your next fill appointment and see the results for yourself.
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