All our glues contain the same active ingredient, which is cyanoacrylate. The majority of allergic reactions are caused by the fumes of cyanoacrylate. If a client has experienced a reaction, the likelihood is now they will always be allergic. That is why we do not recommend performing a treatment on a client who had previously developed an allergic reaction to the adhesive or is showing any signs of the reaction.If you perform a treatment on a client with contraindications to the treatment, you may not be covered under your beauty insurance.Clients who experience just mild discomfort from the glue fumes may benefit from reducing the fumes with Megabonder at the end of the treatment.