varnish on the third day after polishing again matte…

hi, have the following problem: I have a 3-piece golf, which I bought in an absolutely bad paint condition. the color is violet-metallic, the hood and the driver side was completely matt. I got it back with a polishing machine with 3m products after a whole day’s work, after that I conserved it with sonax wax. I was happy, looked great. after three days sun look exactly these displays again just as beautiful. am now really stunned, as I back the body does anyone have a useful idea? is there swissoil possibly a good address?