Nail Product Chemistry and Application (Acrylics, Gels, Wraps)
This domain tests how products polymerize, cure, and fail. Expect questions on monomer and polymer, photoinitiators, mix ratio, overexposure, and wrap resins.
Core rules
- Acrylic systems use a monomer liquid, commonly EMA, and a polymer powder, commonly PMMA. The powder contains an initiator, often benzoyl peroxide. Mixing starts an exothermic polymerization.
- MMA monomer is restricted or banned in many jurisdictions because of severe irritation and poor safety profile; use products labeled for nail use.
- Gel systems use oligomers and photoinitiators cured by UV or LED. Thin coats cure more reliably; an inhibition layer remains on many gels.
- Wraps use fiberglass, silk, or paper with cyanoacrylate or resin. They strengthen but do not treat infection.
- Overexposure can cause allergic contact dermatitis and sensitization. Ventilate, avoid skin contact, use SDS, and do not mix brands.
Worked example
An acrylic bead runs and sets too slowly. Reasoning: too much liquid, an incorrect ratio, old product, or a cold room can slow set. Correct the liquid-to-powder ratio and temperature instead of adding extra catalyst. Excess liquid weakens the enhancement and increases shrinkage.
Traps
Believing more powder means more strength, using MMA, curing gel in thick layers, and mixing liquids and powders from different systems are common errors.