I've used this on Avo cases and it looks like I would have expected the original to have looked when it was new and clean.
https://www.frost.co.uk/vht-black-wr...waAkfUEALw_wcB
I cleaned off the old paint and started from bare aluminium.
The only difficulty is that the ambient temperature needs to be 22 deg. C to get the right effect and that's a rare temperature here, some summers it never gets that hot. Possibly not a problem for Aitor.
PMM