Before I owned my car, someone did an AWFUL touch up job on the driver's side door. It is a thick, big blob with clearcoat painted on top all over the place. It annoys the hell out of me. I got Langka (www.langka.com) to refill it, but need to know how to sand it down. Lee, other experts, any suggestions? Thank you!

Daniel

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1988 Mercedes-Benz 260E