Subsequent work
WARNING: This page is about a different car, the 2016 Porsche Macan and 2015 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
The hardened foam filler can be processed further by sanding, cutting or sawing. It can be painted or varnished. Since the foam is resistant to most solvents, paints and adhesives can be used safely.