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Might be a strange question but 

refitting old wings to newly painted bulkhead would you use a silicone or just fit them as normal? Think I may rub them down fresh paint on this part,
sorry just getting ideas not sure what others have done. 

DC0D5321-161B-4231-8A59-D2E2E2DAD45E.jpeg

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I’d clean up the corrosion, apply a safe acid to kill it (I have had satisfactory results with the steel rust killers), etch and repaint.  Do the same to the A pillar to encapsulate both metals.  Plastic washers behind the bolt heads will help a lot at preventing reoccurrence, as would a dollop of grease between the faces and around the bolt holes and on the bolts themselves.

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Silicone produces acid when hardening. You don't want to have that.

If you want to seal use PU sealants. There are advantages, when no water can run down to the outside of the  footwell on the bulkhead, when the wing is not glued to the bulkhead, but sealed on top and on the sides.

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