Jinxix

Hello! I am looking for a wee bit of help. I know most people on this forum are working with bigger projects than mine, but I'm entirely self taught and need an experts opinion. I took up copper plating 3D prints I've made and sometimes making them into jewelry. Only..... no matter what finish I seem to use on them, it loses its shine after a few wears. I need something that can take being worn and exposed to oil and the elements. Any help is much appreciated. To date I've polished it to xxxx and back, and used protecta-clear on it. Thank you for your time for reading this and I'd appreciate any help anyone can offer.