Dont cut the paint unless its badly weathered , and don't use a polisher unless you are well practised, or you could end up with a disaster. I use Auto Glym resin polish then coat with Auto Glym sealer .I have also seen a VW Scirocco which came to my work which was gleaming ,the guy said he used Turtle Wax Ice, but i dont know how long it will last before it needs to be re-applied, I reckon the longer it takes to apply, the longer the shine will last.