Here are my old 6112’s from 3 winters of use about 40k miles. First two years I sprayed film on it and they held up great. Third year I didn’t apply any.
Maybe our roads are not quite as bad or salted as often as MN like I would think they were. The other day after pressure washing my 5100's while washing the car they still look shiny and almost new even after almost 5 years(2/2018). a little bit of finish blemishes but 0 rust. Every wash for me is done using a pressure washer though and I pressure wash all cracks underneath and all wheel wells/suspension parts during every wash so that could help.
Maybe when its time for me to change them out there will be more options.