A system for sealing containers, comprising: - first conveyor means of containers configured for conveying a plurality of containers from an inlet zone of the system to a sealing zone of the containers; - a first processing station of containers configured for applying a layer of sealing material to at least one end portion of each container of said plurality of containers; - a first moving unit of containers for moving a plurality of containers from said first conveyor means of containers to the first processing station of containers, characterized in that the system further comprises: - a second processing station of containers configured for polishing the layer of sealing material applied by the first processing station of containers to said at least one end portion of each container of the plurality of containers provided by the first conveyor means of containers; in that the first moving unit of containers is also configured for moving a plurality of containers from the first processing station of containers to the second processing station of containers on the at least one end portion of which a layer of sealing material has been applied; and in that the system comprises: - second conveyor means of containers for conveying a plurality of containers from the second processing station of containers to an outlet zone of the system; - a second moving unit of containers configured for moving a plurality of containers from the second processing station of containers to the second conveyor means of containers on the at least one end portion of which the layer of sealing material applied has been polished. - first conveyor means of containers configured for conveying a plurality of containers from an inlet zone of the system to a sealing zone of the containers; - a first processing station of containers configured for applying a layer of sealing material to at least one end portion of each container of said plurality of containers; - a first moving unit of containers for moving a plurality of containers from said first conveyor means of containers to the first processing station of containers, characterized in that the system further comprises: - a second processing station of containers configured for polishing the layer of sealing material applied by the first processing station of containers to said at least one end portion of each container of the plurality of containers provided by the first conveyor means of containers; in that the first moving unit of containers is also configured for moving a plurality of containers from the first processing station of containers to the second processing station of containers on the at least one end portion of which a layer of sealing material has been applied; and in that the system comprises: - second conveyor means of containers for conveying a plurality of containers from the second processing station of containers to an outlet zone of the system; - a second moving unit of containers configured for moving a plurality of containers from the second processing station of containers to the second conveyor means of containers on the at least one end portion of which the layer of sealing material applied has been polished. - a second processing station of containers configured for polishing the layer of sealing material applied by the first processing station of containers to said at least one end portion of each container of the plurality of containers provided by the first conveyor means of containers; in that the first moving unit of containers is also configured for moving a plurality of containers from the first processing station of containers to the second processing station of containers on the at least one end portion of which a layer of sealing material has been applied; and in that the system comprises: - second conveyor means of containers for conveying a plurality of containers from the second processing station of containers to an outlet zone of the system; - a second moving unit of containers configured for moving a plurality of containers from the second processing station of containers to the second conveyor means of containers on the at least one end portion of which the layer of sealing material applied has been polished. - second conveyor means of containers for conveying a plurality of containers from the second processing station of containers to an outlet zone of the system; - a second moving unit of containers configured for moving a plurality of containers from the second processing station of containers to the second conveyor means of containers on the at least one end portion of which the layer of sealing material applied has been polished.