"I haven't protected my flint strikers and have not seen corrosion. If I ever felt the need to protect, then I guess I would grease it and treat it like a gun barrel.

Can someone explain to me how shrink tubing prevents corrosion. I'm thinking that would promote corrosion".

.........I always shrink wrap mine. I don't do it to prevent corrosion; I keep it on a cord with a whistle and brass compass, and I cover it in vinyl to keep it from banging and scraping the other items...