put SS fasteners in Aluminum w/o TEFGEL et al.
Since my mast is down I've been doing all sorts of cool (expensive) things to it. New halyards, LED Tri/anchor, etc. Thought I'd better look at the spreader tips and sure enough the SS screws had that telltale white powdery dust that can only come from electrolysis in Aluminum. Damn people who don't use some kind of dielectric grease in these applications.
Almost as bad as those who use 5200 on things that you may want to take apart later.