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For my level of skill it certainly would be a disasterPersonally, I would do a paint pen. Wet sanding sounds like a recipe for disaster unless you're good doing it.
It's aluminum. A few days of exposed metal will be fine. I would just leave it until you can get it repaired properly.It’s pretty deep and I think maybe some metal is exposed. Should I pen it until a better solution can be applied since the shop the dealer recommended is closed today? Not quite sure how long is okay to leave it as is.