I have an '04 Passat with dark green paint. This weekend while applying the DG 101 I noticed a few scratches on the hood. They are faint and not deep. I would like to remove them at some point and I have seen in some posts that VW has a "hard" paint. My question is whether I really need an UDM or will a Porter 7424 do the job. I can get a 7424 for well under $100 from ebay, etc, while the UDM is nearly 2x as much.