Also with the rust mate, if its all original paint, VW's come with a 12 year bodywork warranty so its worth taking to VW to see if they will do it under warranty. I got a very tiny bit on one arch that I need to see if they will do it under warranty when I get round to it
I don't think VW will touch it as we found out that the previous owner has cut away the lip on both front arches to fit the wheels