I am trying to decide whether or not to prime the wing spars, the aircraft will not be going on floats as there is very limited places to operate in the UK but we do have a humid climate (damp) over here. My experience of 6061 t6 aluminium is that it has a high tolerance to corrosion, the Sonex that I owned was built nearly entirely of 6061 t6 and after 13 years the aluminium still looked brand new with no corrosion. If I do decide to prime the spars what do you do about the fuel tanks, prime and install or install and try to prime the spars as much as possible?