Formulators, OEM processors and factory production personnel specializing in UV gel nail polishes are most likely plagued by three recurring customer complaints: edge lifting within 3 to 7 days after application, brittle cracking under routine bending, and obvious short-term yellowing of clear or white gel polishes.
This article systematically addresses the three major problems of lifting, brittle cracking and yellowing from four perspectives: root cause analysis, resin selection logic, implementable formula rectification plans, and mass production risk avoidance. It also presents dedicated UV resin solutions from Zicai Technology, compatible with full-range systems including base coat, color gel, builder gel and top coat.
I. Identify Root Causes: Core Mechanisms Behind Three Defects
To carry out targeted rectification, we must look beyond operational factors and analyze issues from three core dimensions: resin molecular structure, curing system and formula proportioning, so as to avoid ineffective trial-and-error adjustments.
- Frequent Lifting: Insufficient Adhesion + Excessive Internal Stress
Volume shrinkage occurs during UV curing of nail gel, generating internal stress. If the resin lacks enough polar adhesion groups and flexible chain segments to buffer shrinkage stress, edge lifting or complete delamination will occur. Furthermore, excessively high proportions of high-functionality rigid resins and rigid monomers will amplify curing shrinkage stress, resulting in delamination even with thorough nail surface pretreatment. Meanwhile, frequent hand sweating, oily nail plates, and prolonged exposure to water and detergents will accelerate adhesion failure.
- Brittle Cracking & Chipping: Excessive Hardness, Poor Toughness and Low Elongation at Break
To pursue high gloss and surface hardness, many factories blindly increase the dosage of high-functionality resins and rigid monomers, resulting in rigid yet brittle gel films. Minor bending, impact or mechanical stress on natural nails will trigger cracks, edge chipping and fracture. This problem is especially prominent for builder gels and reinforcing gels; insufficient toughness prevents the gel from accommodating daily nail deformation, leading to a sharp rise in customer complaints.
- Rapid Yellowing: Aromatic System + Over-Curing + Lack of Weather-Resistant Molecular Structure
Yellowing is the most prevalent quality defect for nail gels, primarily caused by aromatic epoxy acrylates and conventional aromatic polyurethane acrylates (PUA). The benzene ring structure in such resins is prone to oxidation under UV irradiation and high temperature, forming chromophoric groups and triggering gel discoloration. In addition, over-curing during production or application, spectral shift from aging UV lamps, and excessively thick top coat application will accelerate yellowing, which is particularly noticeable for clear and white gel variants.
II. Targeted Resin Selection: Primary UV Resin Solutions for Three Pain Points
There is no universal resin for all nail gel systems, as different gel layers have drastically different performance requirements. Resin grades must be selected purposefully to eliminate defects at the source. Below is the full-scenario resin matching program from Zicai UV Resins:
- Anti-Lifting & Anti-Delamination: High-Adhesion Flexible PUA Resins
For lifting-prone base coats and general color gels, Zicai A2244 all-in-one base coat resin is the preferred option. Equipped with inherent polar adhesion groups, it exhibits excellent compatibility with natural nails and artificial nail tips. Its flexible molecular chains effectively release curing shrinkage stress and greatly improve wet adhesion, suitable for challenging usage scenarios such as sweaty hands and frequent water exposure.
For sensitive nail plates and acid-free formulation requirements, Zicai A2245 acid-free adhesive PUA resin serves as an alternative. It eliminates the need for acidic primers, balances environmental friendliness and long-lasting adhesion, and resolves both nail damage and delamination issues associated with acidic systems.
- Anti-Cracking & Anti-Chipping: High-Toughness Film-Forming Resins
For thick-coat builder gels, reinforcing gels prone to brittleness and cracking, Zicai A2281-2 high-toughness film-forming resin is the core solution. It strikes an optimal balance between hardness and flexibility, delivering outstanding elongation at break after curing. The cured film bends freely following nail deformation, perfectly solving issues including thin nail breakage, edge chipping during removal and spontaneous cracking in daily use. Meanwhile, it delivers plump molding, smooth camber without sagging or deformation.
- Long-Term Anti-Yellowing: Aliphatic Weather-Resistant Resin System
For white gels, clear gels and high-gloss top coats requiring superior anti-yellow performance, Zicai A3209A anti-yellow dedicated resin is the top choice. Designed with aliphatic molecular structures free of oxidation-prone benzene rings, it fundamentally inhibits yellowing at the molecular level. Compatible with mainstream LED 395/405 nm curing light sources, it ensures uniform curing and low residual monomers, maintaining long-term clarity and whiteness of gel films and extending shelf life and service life of finished nail products.
III. Reference Formula Rectification Schemes
Combined with common industry system parameters and resin properties, targeted revised formulas are sorted out for direct mass production deployment, effectively mitigating the three major defects without repeated trial testing.
- Rectification for Lifting & Delamination: Reduce Internal Stress & Strengthen Adhesion
Common flaws in problematic original formulas: excessive proportion of rigid high-functionality resins, rigid diluting monomers and insufficient flexible components.
Rectification strategy: reduce system rigidity, improve flexibility and adhesion, and relieve shrinkage stress.
Core adjustments: Replace primary rigid resins in the system with A2244 at a loading of 45%–50%; cut high-shrink rigid monomers such as TPGDA and HDDA from 20% to 15%; moderately supplement flexible monomers to enhance film ductility, drastically lowering post-curing internal stress and significantly boosting long-term adhesion.
- Rectification for Brittle Cracking & Edge Chipping: Balance Rigidity and Toughness
Common flaws in problematic original formulas: one-sided pursuit of extreme hardness, lack of toughening resins, high brittleness and poor impact resistance of cured films.
Rectification strategy: incorporate high-toughness resins to raise elongation at break while retaining basic hardness.
Core adjustments: Partially replace high-hardness epoxy acrylates with A2281-2 toughening resin in builder and reinforcing gel systems; fine-tune system viscosity to guarantee leveling property while endowing cured films with both surface hardness and bending resistance, thoroughly eliminating cracking from impact and edge chipping during removal.
- Rectification for Yellowing: Switch to Weather-Resistant Aliphatic System & Optimize Curing Process
Common flaws in problematic original formulas: aromatic resins as base materials plus improper formulation and over-curing accelerating discoloration.
Rectification strategy: fully switch to aliphatic anti-yellow resins, standardize curing parameters and avoid human-induced yellowing.
Core adjustments: Phase out conventional aromatic PUA/EA resins for white/clear gels and top coats, fully adopting aliphatic anti-yellow resin A3209A; rigorously control curing duration to prevent oxidative cleavage of molecular chains from over-exposure; regularly replace aging lamps to avoid overall yellowing triggered by spectral deviation.
IV. Key Risk Avoidance Guidelines
- Avoid blind pursuit of ultra-fast curing: High-functionality systems feature fast curing and high hardness but generate massive shrinkage stress, an invisible trigger for lifting and cracking. Formulation design shall follow the principle of balancing rigidity and toughness.
- Prioritize resin modification for yellowing issues before process adjustment: Process optimization can only alleviate yellowing rather than cure it fundamentally. Only switching to aliphatic weather-resistant resins can achieve long-term anti-yellow performance.
- Customize resins for different layers instead of adopting a universal formulation: Base coats prioritize adhesion, builder gels focus on toughness, and top coats demand anti-yellow and abrasion resistance. Applying identical resin across all layers inevitably leads to performance drawbacks.
- Strictly control system viscosity and coating thickness: Excessively thick coatings cause uneven surface & internal curing, accumulated internal stress, early cracking and lifting, alongside elevated yellowing risk.
V. Conclusion
Many nail gel formulators fall into a debugging misconception: repeatedly adjusting monomer ratios, modifying curing parameters and optimizing application techniques, yet failing to resolve recurring lifting, cracking and yellowing issues. Fundamentally, they overlook that primary UV resins are the underlying determinant of core film properties.
A qualified nail gel formula is never defined by higher hardness or faster curing speed. Mature, stable mass-production formulations feature targeted property matching for each layer: base coats achieve long-lasting adhesion with properly selected high-adhesion flexible resins instead of excessive adhesion promoters; builder/reinforcing gels avoid overloading rigid fillers, relying on rigidity-toughness balance to accommodate daily nail deformation; high-gloss top coats and clear/white gels must adopt benzene-ring-free aliphatic structures at the molecular level to sustain long-term transparent appearance and prevent yellowing.
If you require sample requests, customized formula tuning or complete mass production proportion parameters, feel free to leave a comment detailing your specific requirements, or contact us via private message for free technical consultation!
Post time: Jun-23-2026
