Short answer:
It is used in order to harden the gel.
Longer explanatory answer:
The world is a mysterious place and some things seems like magic to those not "initiated".
We all can relate to glue, how it hardens and stick stuff tight as it dries.
The solvents in the glue evaporates into the air and the glue becomes "solid".
Other glue may even combine this action with a chemical reaction in order to harden.
Two component glue like Araldite works by mixing two compounds. together they start a process of stiffening and becoming solid.
Science have gone further, and found materials that react to different wavelengths of light.
This is the basic idea behind certain plastic fillings in use by dentists and Gel Nail Service.
A compound is added that is soft and sticky. When exposed to Ultra Violet light, this will start a reaction in the compound to make it stiff/hard/sturdy.
How hard it becomes is dependent on the build up of polymers and the amount of UV radiation it gets.
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