SS screws in alum frame window?

[Marin]

Galvanized fasteners on a boat in saltwater!?

I'd never use galvanized fasteners on a boat. But they are the solution on a floatplane where the strut and spreader bar systems need very strong fasteners but stainless steel cannot be used.

 

[bayview]

I agree with N47 but those plastic washers are hard to find especially for recessed screws.