Basics of Gel

If you’ve ever felt a sudden burst of heat during a gel manicure service, you’ve experienced what nail professionals call a heat spike. Heat spikes can occur during curing of nail gels, nail art applications, and gel extensions under UV or LED light.

While heat spikes are a normal part of the curing process, understanding why they happen—and how to reduce them—can greatly improve client comfort and service quality.

The 3 types of gels have distinct characteristics and bond types that influence the chance of a pontential heat spike.

What Causes Heat Spikes?

A heat spike is caused by an exothermic reaction that occurs when gel hardens under UV or LED light. As the gel cures, its molecules rapidly form bonds, releasing energy in the form of heat.

The faster the reaction occurs, the more heat is produced. This heat can temporarily build up in the gel layer and transfer to the natural nail, creating a sudden warming sensation.

Heat spikes are more noticeable in thicker applications because more product is curing at once, producing a higher concentration of heat.

The Science of Gel: Why Some Products Heat More Than Others

Different gel systems contain varying levels of molecular bonding, which directly affects their curing speed and heat output.

• Soft Gel: Sparse amount of bonds
• Semi-Hard Gel: Moderate amount of bonds
• Hard Gel: High amount of bonds

Gels with fewer bonds tend to cure more slowly and generate less heat. Conversely, higher-bond gels cure more rapidly, increasing the likelihood of a heat spike during the process.

How to Prevent or Reduce Heat Spikes

While heat spikes cannot always be completely avoided, there are several professional techniques that can significantly reduce their intensity.

1. Apply Thin Layers

One of the most effective ways to reduce heat spikes is to apply gel in thin, controlled layers. Thicker applications generate more heat during curing, especially with base gels, builder gels, and top coats.

For clients with sensitive nail beds, apply and cure one to two thin layers before building the structured apex. Thin layers allow the gel to cure more evenly and reduce heat buildup.

2. Flash Cure Between Layers

Flash curing helps control the curing process by partially setting each layer before full curing.

Benefits of flash curing include:

• Reduced heat spike intensity
• Better product control and structure
• Prevention of gel flooding sidewalls
• More stable gel placement during structured manicures

Flash curing allows the gel to harden progressively, rather than all at once, helping reduce heat buildup. However, always ensure the gel is fully cured at the end of the service.

3. Use a Low Heat Mode Lamp

A low heat mode provides a gradual increase in lamp intensity, helping reduce sudden temperature spikes during curing.

The KOKOIST Le Blanc lamp features a 90-second low heat mode that flashes LED/UV output to create a gentler curing process and minimize discomfort.

If your lamp does not include a low heat setting, you can temporarily remove the client’s hand from the lamp if heat becomes uncomfortable. Allow the nail to cool briefly before continuing curing. Repeat as needed until fully cured.

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Stick Light & Adjustable Holder LED/UV

This compact stick light comes with an adjustable holder, allowing for a hands-free flash cure.

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Le Blanc Hyrbid LED/UV Cordless Light

A lamp with 4 timer options–including Low Heat Mode, designed to minimize heat spikes!

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Final Thoughts

Heat spikes are a natural result of the gel curing process, but they can be managed effectively with the right techniques and tools.

By understanding the chemistry behind gel systems and applying best practices such as thin layering, flash curing, and low heat curing modes, nail professionals can significantly improve comfort without compromising results.

Important: Always ensure gels are completely cured according to manufacturer instructions for optimal performance, durability, and safety.