Update on the primer and corrosion experiment.
Here an image of the start, 3 months ago:
Here an image of the status after 1 month:
– Epoxy primer is better than wash primer
– Alodine is nasty but very good stuff
– Anodized aluminium is more scratch resistant than aluminium treated with Alodine without a primer
Note: I abused the samples much more than the aluminium would ever face in real life (hangared and vfr only).