Thanks for taking the time to reply.To answer your question .. It is quite hard for anyone to over cure their gel and you won't do it by doing your nail art so don't worry. Gel that is over cured goes brittle and it would take days under a UV lamp which is not going to happen. Think of how long our gels are exposed in daylight; weeks on end! Brittleness is not a hazard to your client the way under curing a product is. A product that has not fully reacted (cured) and become inert is a product that is going to react with what it is near.