I see it here with the salt air... It does help... I've been looking into doing it to my Econoline roof as we all know they tend to rot out... Water gets below the seam sealer in the gutter and it starts to rust out...
I've also seen it applied to just the rocker panel of the van... With being able to "tint" the bedliner material to the color of the vehicle, it's a no brainer to do it if it'll help you... Or you can always do a
@Mark Saiger and rinse off your van every day before putting it in the shop.... Not everyone can afford what
@Desk Jockey has to rinse off his fleet of vans and lets not forget
@Brian H who has there own carwash and paint booth...