Undercarriage question - fluid film/paint?

My undercarriage looks tired. Some surface rust and black paint is tired. I’m in SoCal and been researching fluid film vs just a rattle can on some parts. If you used FF, is there prep involved other than a clean surface? Is painting recommended prior?

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Fluid Film Application Question

FFSG is an undercoating application system designed for use of Fluid Film (NAS) non-aerosol. The kit includes a quart sized bottle, gun, adjustable nozzle, 15 flexible wand and a 22 flexible 360 degree spray wand. The gun is rated for 175 PSI. While designed for undercoating cars and trucks, this system can be used on any surface that requires covering a larger area quickly.

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Rust Preventive Lubricant Solvent Free, will not dry out. Long Lasting Environmentally friendly. Lanolin based. Clean. Anti freezing agent. Geat for

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