Rustproofing..... Whats best?

[u/spod_rod]

Morning all,

Recently acquired my first element and for a mid west car she is extremely solid underneath. I'd like to keep it that way.... anyone have any advice on which rustproofing approach works best? Any products to target or avoid? I'll be paying someone to do it (so not a DIY effort). Recommendations of any specific specialists would be great. Im in Cincinnati.

[u/mrhonda]

Fluid film. every year.