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I coated all four wheel arches. Restricting myself to the rear 1/2 of both front arches, to avoid completely removing the plastic stone chip guards. Followed by the entire boot area.
front rear - with fuel inlet visible
Whilst it looks like a bitumen rust preventing coating. It does help with sound proofing. As proven by a brief trip to the supermarket & back over a coarse stone chip road surface. Without having done any decible readings, IMO the sound removal is just as good as the Dynamat etc, I used on the interior. And should be even better, after I am able to cover the area under the cabin.