inputs.text: like motorcycle helmets - purchased mount supposed adhere curved surfaces like motorcycle helmets not hoped use upcoming long distance motorcycle trip west tried three helmets no luck full face half shorty helmet cleaned surface rehemove residue not wax helmets anyway two glossy surface one matte finish 5 minutes one three suction cups pops loose regardless whether prewet suction cupsi think platform mounted flat exerts upwards pressure causing suction fail sure come handy use flat surfaces leaving home tripso planning use curved surface like helmet carefulnote seller called confirm color black not pink shipped via priority mail no extra charge great