Gels, UV Gels, and Light-Cured Systems
This domain tests gel chemistry, curing, lamp compatibility, and service safety. The exam expects you to know that gel systems are not interchangeable and that curing depends on the lamp, the product, and the thickness of the layer.
Curing and application
- Gel contains photoinitiators that react to a specific wavelength of light. Not every gel cures in every lamp.
- Apply thin, even layers; thick layers can cure unevenly and shrink.
- Follow the manufacturer's cure time for the specific lamp and gel.
- Keep gel off skin and cuticle. Uncured gel on skin can cause irritation or allergic reaction.
- The inhibition layer is the sticky uncured surface; remove it only as the system directs.
- Maintain lamps: clean surfaces, replace bulbs or units as recommended, and do not overcrowd the hand.
Worked example
A client's gel overlay peels from the sidewalls after three days. Reasoning: the likely causes are incomplete prep, product on the skin, too-thick application, or a lamp that is not compatible with the gel. The technician should remove the gel, check lamp age and bulb condition, confirm the gel-lamp match, re-prep, and apply thinner layers with correct cure times.
Traps that cost marks
- Assuming all LED lamps cure all gels; check the manufacturer's compatibility chart.
- Curing too thick a layer and calling the sticky layer “uncured.”
- Skipping nail prep or leaving cuticle tissue on the plate.
- Over-filing the natural nail during removal.
- Using a UV lamp with cracked bulbs or broken reflectors.