Maybe I'm paranoid, but I live in Ireland where is rains most days in the winter..... and the Spring, and the Autumn and.....
Anyhow, right at the beginning I had to learn about corrosion protection too. I ended up going belt and braces. I etch and a two pack epoxy primed everything. For good measure I brushed on JC5 on all surfaces before mating them and put some in all holes before inserting rivets or permanent bolts.
In the winter, the air is so damp, you can watch uncovered tools rust practically in real time. Any time the temperature increases by a degree or two in a relatively short period of time, condensation covers anything and everything inside and out and because its cold, it can take days to dry. If lived where is was dry, I don't think I would have gone to so much trouble, and this would have shortened my build time considerably - not to mention cost. This would apply also if you were confident that the aircraft would spend its idle time (for the duration of its existence) in a temperature controlled environment
Andrew Butler,
RV7 EI-EEO - flying since Feb 2011.
EITT Ireland.