At this stage I should've had a look ahead and realised the foam trailing edge wedges attach to the skins on bare aluminium stuck on with tank sealant. That being the case, masking tape was required after all four skins were etched.
I thought I'd take a quick pic showing the difference between polished and sanded aluminium...
Slowly getting through all the parts readying them for etching.
Here's the trim tab push rod parts being etched...
and a short video of today's action...
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