That's a tough one to answer without seeing the damage.
Something else to consider is Langka blob remover (google it)
If you get touchup paint in the correct color, use Langka to smooth it, and then get clearcoat to cover that, some people have had good results.
The instant you start putting sandpaper on the car you're probably better off letting a body shop do it.
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'16 M4 Vert - San Marino Blue/Sahkir 6MT
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