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This site is usually good for reference :-
@lynx knows quite a bit about auto underbody treatment.
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Only used frost for the POR15 tank lining kits.
Have used the products. Am a fan of this stuff https://bilthamber.com/product/hydrate-80/ to convert rusty metal then https://bilthamber.com/product/epoxy-mastic/ Both UK made. Prefer the 2 part stuff over body schutz as have had bad experience, poorly applied on poorly preped areas.
Lots of people say lanolin products, but you do need to reapply every couple of years.
Cheers. I'll check it out.
Was thinking tough black.