What you’re referring to is a heat spike. Heat spikes are actually fiction burns. When gels cure, the molecules are running around to link up with each other and they can bump into each other on the way to link up. When too many molecules bump into each other it creates friction which generates heat. This happens when applying your gel layers too thick. Damaged, thin nails will be more sensitive to this phenomenon. To avoid it, make sure to apply thin layers of your gel products. If you do feel a heat spike when your nails are curing in your 900 FX LED Lamp, immediately remove your hand for 2-3 seconds and then go back in for a full cure. This will give your nails time to cool down to prevent the heat spike from occurring. We also recommend trying out the variable low-heat mode on our 900 FX LED lamp which gradually increases the strength of the light in 10 second increments to prevent heat spikes.