Jessica Coat of Armour Natural Nail Shield 0.5 Fl.Oz. Coat of Armour is a new revolutionary new technology that provides a durable shield over the natural nail safeguarding them from chipping, cracking and breaking. Formulated with state-of-the art resins and polymers, Coat of Armour safely mimics the hardness of an artificial nail without damaging your natural nail and is easily removed with polish remover.