I'll admit I'm a little surprised that the FK (yep, the FK1000P + FK425 as Drying Aid) is still such a viable choice. When I read some of the takes on various more-modern products (especially the durability), I consistently think that I might as well just stick with it.
I got *years* out of OptiCoat v1.0 on a set of wheels, but I gather most of today's coatings don't last that long. Collinite and KSG can last a while if I layer them heavily, but *for me* the FK lasts much longer, well over a year for me (note that at least one member here gets better durability out of Collinite- !YMMV!
The OptiCoat v1.0 did *not* shed contamination any better than the FK, no discernible difference at all, at least not for me.
The FK is dead-nuts easy-peasy, whereas the OptiCoat v1.0 was a little challenging (e.g., avoiding high spots) and that was with my OLD-normal vision. No way I'd attempt to get it right with this new-normal vision. OK, yeah...that's just me but it's a biggie.
The FK has resisted etching so well that I no longer even *think* about damage from bug/birds. I cannot imagine how any other product could beat that since it's a simple binary: does it protect for me or not? Yes, it does, case closed.
A tin of FK will last me for the rest of my life, with *lots* left over. It doesn't dry out readily, and IME can be revitalized with some FK425 if it does (worked great on a little sample tin from FK1). The last two coatings I bought (for wheels) dried out before I got around to using them, whilewhat's left of my 20YO tin of FK is still fine.
I wish it looked like Souveran. I wish it were as easy as SprayWaxes. I wish it were more trim-friendly. But then I wish cars were self-cleaning too.