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Common Defects in UV Gel Nail Polish (Part 5)

Release time:

2026-04-30 12:08

Common Defects in UV Gel Nail Polish (Part 5)

During the application of UV gel nail polish, yellowing is one of the common quality issues affecting light-colored and transparent products. Yellowing manifests as a yellowish tint appearing in what was originally a clear or light-colored coating after curing or following a period of use—white turns off-white, and clear becomes pale yellow—severely compromising the visual appeal of the manicure. Unlike physical defects such as wrinkling or chipping, yellowing is a chemical aging phenomenon. Understanding the root causes of yellowing can help users consciously avoid this issue during both application and storage.

I. Manifestations and Impacts of Yellowing

Yellowing of gel nail polish coatings gradually shifts from their original transparent or white hue to a yellowish tone, with the degree of discoloration ranging from slight yellowing to noticeable yellowness. Light shades such as white, pale pink, and nude are particularly susceptible to yellowing; even minor yellowing can significantly detract from the overall aesthetic appeal. Once the clear top coat yellows, it casts a yellow tint over the underlying color gel, distorting the entire color palette. Yellowing not only compromises the visual appeal of the manicure but also raises concerns about product quality among users. In severe cases, the manicure often needs to be removed prematurely, failing to deliver the expected longevity.

II. Main Causes of Yellowing

1. Over-curing is the primary cause of yellowing. Prolonged exposure to UV or LED lamps, or the use of lamps with excessively high power, can subject the coating to excessive ultraviolet radiation. The energy of ultraviolet light can disrupt the molecular structure of the resin, leading to chain scission or oxidation reactions that generate chromophoric groups, resulting in yellowing of the coating. This process is analogous to the yellowing of white plastic after prolonged exposure to sunlight. Some users, in an effort to ensure complete curing, inadvertently extend the irradiation time too long, thereby increasing the risk of yellowing.

2. Lamp aging is an often-overlooked contributing factor. During operation, UV lamps gradually degrade, resulting in changes to their emission spectrum and potential shifts in wavelength. The ultraviolet wavelengths emitted by aged lamps may fall outside the absorption range specified in the product design, which not only reduces curing efficiency but can also accelerate resin degradation, leading to yellowing. In addition, lamp aging is accompanied by unstable output energy; fluctuating energy levels—sometimes high, sometimes low—further increase the likelihood of yellowing.

3. The inherent yellowing resistance of the product is a fundamental factor. Different resin systems exhibit varying degrees of UV resistance, with aliphatic polyurethane acrylates generally outperforming aromatic polyurethane acrylates in this regard. Some products employ low-cost resins and photoinitiators that contain unsaturated bonds in their molecular structure—bonds that are readily degraded by UV radiation—resulting in poor yellowing resistance and a tendency to yellow even under normal curing conditions. Such products are inherently limited in terms of formulation.

4. Exposure to chemicals can also accelerate yellowing. Certain ingredients in hair dyes and some skincare products can penetrate the coating and react with the resin, leading to discoloration. Prolonged exposure to such chemical environments after a manicure may cause yellowing even when using high-performance products.

III. Irreversibility of Yellowing

Yellowing is an irreversible chemical change. Once a coating has yellowed, its original color cannot be restored by wiping or touch-up. Slightly yellowed manicures may still be wearable, but their visual appeal is diminished; severely yellowed manicures must be removed and redone. This characteristic underscores the importance of preventing yellowing over correcting it.

IV. Conclusion

Yellowing is a common quality issue with light-colored and transparent UV gel polishes, primarily stemming from three factors: curing conditions, product quality, and environmental exposure. Over-curing and aging of the lamp can result in excessive UV radiation exposure, accelerating resin degradation; low-quality products often lack sufficient yellowing resistance in their formulations; and contact with certain chemicals can also trigger yellowing. Once yellowing occurs, it is irreversible, making prevention far more important than remediation. Understanding the root causes of yellowing and rigorously controlling curing time, regularly replacing the curing lamp, and selecting products from brands known for excellent yellowing resistance are essential strategies for minimizing this problem.

Disclaimer: The above content has been compiled from publicly available sources for reference only; if any infringement occurs, please contact us and we will address it promptly.

Boxing Recommended Products – UV Gel Nail Polish
Base coat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-02H	Phosphate ester acrylate monomer	Enhance adhesion to substrates such as metal, glass, and plastic.
B-2016	Polyester acrylate	High molecular weight, excellent flexibility, strong adhesion, and low heat release.
B-2018	Aliphatic polyurethane acrylate	Good adhesion, good flexibility, and water resistance.
Colored tape
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-151DM	Modified epoxy acrylate	Low halogen, yellowing resistance, excellent plating performance, and strong adhesion.
B-162	Epoxy acrylate	Fast curing, low odor, high gloss, and high fullness
B-166A	Modified epoxy acrylate	Good flexibility and strong adhesion
B-166A-85	Modified epoxy acrylate	Good flexibility, excellent adhesion, contains 15% HEMA
B-166A-85P	Modified epoxy acrylate	Good flexibility, excellent adhesion, contains 15% HEMA
B-27	Active amine photosensitizing promoter	Low color number, benzene-free, low odor, antioxidant and anti-polymerization
B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, and impact resistance.
Extended glue
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-210D	Aliphatic polyurethane acrylate	Fast curing, low exotherm, and good toughness
T-2022D	Aliphatic polyurethane acrylate	Non-stick, low heat generation, strong adhesion, high hardness
Sealant glue
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-376	Aliphatic polyurethane acrylate	LED yellowing is minimal, and the nail polish formulation exhibits excellent stability.
B-412T-6	Aliphatic polyurethane acrylate	Good toughness, tin-free, and excellent stability of the nail polish formulation.
Matte Sealing Layer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-329D	Aliphatic polyurethane acrylate	Low irritation, low viscosity, excellent wettability, and a pleasant feel.
One-step adhesive
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-315	Aliphatic polyurethane acrylate	Wear and chemical resistance, high hardness, toughness, and yellowing resistance.
A-grade film
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA
B-216	Aliphatic polyurethane acrylate	Fast curing, high build, and excellent toughness
B-268M	Aliphatic polyurethane acrylate	Good flexibility, excellent adhesion, excellent plating performance, and strong hiding power.
B-619W	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, wear resistance, and chemical resistance.
Single Product Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM1211 (HPMA)	Hydroxypropyl methacrylate	HEMA-free, high strength, low irritation, high adhesion

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Common Defects in UV Gel Nail Polish (Part 6)

Common Defects in UV Gel Nail Polish (Part 4)