Primer / corrosion experiment [after 3 months]

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:

I extra tried to damage the samples by scratching with a key, here the current status:

– 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).