I have read all the rust posts and still confused.. I can now drive my bus in the back yard and want to get to the surface rust developing from lots of camping and travelling. SO do I sand fine grade then ankor wax or penetrol on the outside? (Not going back to bare metal all over not painting yet) I want to do the rubber seals also do I wax all the surfaces or fisholine/ penetrol I know bunnings sell penetrol but I thought that lasted about 6mths and ankor wax 2 years?? First timer doing this stuff now I can get my buss of the street…..