Am posting from Devon in the UK.
Am polishing a 70 overlander. Have had serious filliform corrosion so went down the sanding route. Used foam backed discs and special cutting oil. Am now at compound stage and using nuvite g6 with a buffpro. Am getting very notacable blue streaks in the work.. they show up in direct sunlight only (as you can see in most other lights the panel looks good.), and will not polish or clean off. Am using mineral spirits and micro fibre for clean up. Will post some photo..any help greatly appreciated as it's driving me nuts!!!!