Pieter from Arcana is back at it again: these swords were shaped using a belt sander with 80 grit. He notes that this left the surface to coarse and looking a bit pitted. Higher grit sandpaper might leave the surface smoother, and heat treating the foam could potentially get rid of the last bumps, but Pieter hasn’t tested that theory yet.
The swords are first painted with black latex and then sealed using plastidip. After this sealing, the swords were primed for any available kind of paint. In this case Pieter airbrushed heavily diluted silver and bronze metallic model paint. Then the swords were sealed again with plastidip.