I’m surprised I haven’t seen more undercoat businesses to be honest. They were everywhere in Florida (Ziebart).
The rust looks pretty bad in the photo but it seems to have cleaned up well with a wire wheel brush. Applied some rust converter and will give it a top coat of rattle can paint tomorrow. I have seen a couple of used ones out there for a decent price, but they’re for the R52s, the model after mine. I’d have to research to see if they’re compatible if I should need to go that route. But there’s a lot of metal left under there, thankfully.
Fingers crossed. It’s actually been (tortuously) fun and a good learning experience.
And yes, I do recall someone mentioning something ominous.