Over-curing a gel is possible. Some gels will discolor when over-cured and some will lose the gloss, while others will do both or neither. So much of this depends on the gel and the curing light. Each manufacturer should be able to assist the nail technician in what issues they may see with over-curing the product. If the desire is to freeze the gel in the light for 15 seconds and not over-cure the gel, then I would advise only freezing one finger at a time — holding the rest of the fingernails out of the light (almost like playing “Twister” when you cure the gels). — Jim McConnell is the CEO of Light Elegance.