Get a 1 inch paint brush and a bottle of wood glue. Pour the wood glue into a bowl and add a few drops of water to thin it out a little. Paint small sections of the outside of the helmet and let dry. Wood glue will fix your issue because 1) It has no solvents to disolve the tape. 2) once dry it is waterproof so you can bondo right over it and resin and fiberglass the inside of the helmet.