Lash
Retention Guide

Lash Weight & Length

• Classic extensions are heavier than volume fibers — only apply classics to strong, youthful, healthy natural lashes.
• Mimic the look of classics with closed 4–6D fans made from volume fibers — a healthier alternative.
• Avoid extensions that are too long or heavy; they cause breakage, thinning, or traction alopecia.
• If a natural lash droops after an extension is applied, it's overloaded — remove it immediately using the banana peel technique.
• Length rule: do not exceed 3mm beyond the natural lash. If natural lashes are 9–11mm, apply 12–14mm extensions.
• Recommend bi-weekly fills to reduce gravity's effects; tri-weekly may suit slower lash cycles. Always remove outgrown extensions during fills.

Customize by natural lash strength

• Anagen (baby) lash: only a 2–3D .03 fan.
• Healthy telogen lash: up to a 15D fan with .03 fibers.
• Weak, unhealthy, or mature lashes: only mega-volume .02 or .03 fibers, even for volume sets — no classics on compromised lashes.

Diameter guide: Classic .10, .12, .15 · Volume fans .07, .05 (2–10D) · Mega volume .03, .02 (10D+). A 19D fan of .03 fibers weighs about the same as a single .15 classic — one mega-volume fan equals one traditional classic lash in weight.

Natural Lash Curl

• Straighter curls (B, J, C, CC) on naturally straight lashes for a smooth, lasting bond.
• Curlier extensions (C, CC, D) on naturally curly lashes to enhance lift and blend.
• For downturned lashes, apply on top of the natural lash to create lift.
• For curly lashes, apply underneath or to the side for alignment and retention.
• Natural lashes often don't grow straight — apply the extension in a straight direction even if the natural lash veers, wrapping the fibers around the base while wet. Don't let the extension touch the eyelid skin.

Application: Coverage, Prep & Comfort

• Coverage: lash a high percentage of the natural lashes. If you only lash ~25%, a single lost fan leaves an obvious gap; strong coverage hides shedding.
• Prep: always work on clean natural lashes — cleanse and rinse before a fill or full set.
• Tape for comfort: tape the client so the eye isn't slightly open. You shouldn't see the white of the eye — that causes irritation and fume burn, and watering eyes change moisture and make application harder.

Lash pH & Moisture

• The natural lash line pH is typically 4.5–5.5 (slightly acidic). Maintaining it is essential for lash health, adhesive performance, and comfort.
• Adhesive bonds best in a slightly acidic environment; too alkaline compromises retention.
• Pre-treatment products (primers, cleansers) should be pH-balanced around 5.
• Alkaline cleansers/removers raise pH and weaken the bond; a disrupted pH causes irritation, poor retention, and shedding.
• For oily or high-pH clients, use a pH-balancing prep spray or primer to restore bonding conditions.

Shampoo vs. primer — you need both

• Shampoo: daily cleansing — removes makeup, oils, and impurities, maintains hygiene, safe for at-home aftercare.
• Primer: pre-service only — removes residue, speeds adhesive drying, improves bond and retention, lightly conditions, balances pH. Apply only to clean lashes.

Adhesive 101

Drying vs. curing

• Drying: the surface becoming tacky enough for the next lash — 1–3 seconds depending on adhesive and humidity. Incomplete drying causes lashes to stick or shift.
• Curing: the complete chemical hardening from liquid to solid. Requires humidity to fully polymerize. Traditionally takes 24–48 hours; instant bonding agents cure now.
• Poor curing hurts retention and can irritate eyes — like leaving the nail salon with uncured gel. Early moisture (swimming, steam) disrupts curing.

Your lash environment

• Humidity: ideal 45–65% (optimal often 50–60%). Too low slows curing, increases fumes, keeps adhesive wet (stickies/sliding). Too high cures too fast, causing poor attachment, clumping, or beads.
• Temperature: best 64–72°F. Outside the adhesive's range, it won't perform.
• Use a hygrometer to monitor both. Adjust with a humidifier/nano mister (raise humidity), dehumidifier (lower it), heater (warm), or A/C (cool).
• Match glue to your speed: Beginner 2 sec · Intermediate 1 sec · Advanced 0.5 sec · Mastery 0.3 sec.

Adhesive care

• Shake 30–60 seconds before use; burp the adhesive and wipe the nozzle with a lint-free wipe.
• Dispense a fresh drop every 15–30 minutes; never mix a fresh dot with an old one.
• Dispense your new dot so your hand doesn't touch old dots (right-handed: left→right; left-handed: right→left). Use a new glue ring each dispense.
• Replace the dot when it goes stringy or the bubble flattens/deforms — cure time shifts with humidity and temperature.
• Store cool, dry, airtight with silica or dry rice; don't refrigerate after opening (65–72°F ideal).
• Track open/expiration dates — most adhesives last 4–6 weeks once opened.

The ingredients you're working with

Cyanoacrylate is the main bonding agent (commonly 80–95%; sensitive formulas 50–70%; high-strength over 90%, faster but more irritating). Carbon black gives black adhesives their color (not in clear adhesives — better for sensitive eyes). Stabilizers extend shelf life, thickeners adjust flow, plasticizers add flexibility, and inhibitors prevent premature polymerization in the bottle.

Application Process

Full set: set up your station → cleanse & rinse (fan dry) → prime if oily (fan dry) → tape bottom lashes down and lift eyelids for access → apply extensions using tape-back isolation → fan dry 2 min → optional bonding agent, fan dry 2 min → communicate aftercare and book the next fill.

Fill: same prep, then banana-peel off any outgrown or twisting lashes before applying fresh fans.

Taping: tape bottom lashes down so top and bottom don't stick together — use eye pads, tape, or both; never touch the waterline; check comfort after taping.

Aftercare for Clients

• No excessive heat, oil, or salt.
• Wash 2× per day; wash at the sink, not in the shower; fan dry and brush with a wand.
• Don't sleep on your face; keep fingers out of your lashes.
• Keep a daily facial regimen; schedule bi-weekly fills.

Premature shedding factors

Unhealthy natural lashes, pregnancy, breastfeeding, thyroid or hormonal conditions, medications, seasonal shedding, alopecia, steam facials, hair-oil treatments, chemo, and inconsistent fills. Oil in makeup or skincare, oily skin, poor hygiene, touching lashes, sleeping on the face, crying, excessive heat, and not washing after workouts all shorten a set's life too.