I used a previous S1 once when the roads were dry but salt dust was apparent.
When I next went to the car and pulled it out of the garage the nose cowl at the beading edges was all blistered and flaking. Became apparent that the lack of paint on the edges was minimal.
Wife has just taken delivery of a new Plus Four which she intends to use daily. There’s zero rust prevention on the underside so I sprayed it with dinotrol
My usual preference is ACF 50 applied through an air gun and compressor