My understanding is that Boeshield was developed specifically to protect aircraft structure from corrosion. Aircraft are all aluminum, but the rivets are necessarily a different alloy from the skins and bulkheads, and the high-strength alloys (2024 T3 or 7075) used are rich in copper and zinc and poor in corrosion resistance. Even Alclad, which has a sheet of strong stuff sandwiched between two sheets of pure aluminum, leaves the edges unprotected.
I have seen it used with success inside rockets, which sit for a long time on the pad in the World's Worst Corrosion Environment (tm), and also inside seaplanes, although Lake Amphibian now has something stronger. It looks like amber undercoating.
On my own aircraft I used Boeshield whenever I had a panel off, and regularly inside the fuselage and wings where I could reach. In a dozen years of operation a stone's throw from the saltwater, I never saw any corrosion.
I was not aware that it can be used outside. I think it would be better to use paint.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
