Spray Ceramic Coat frame and underneath?

Now that we have spray ceramic coatings relatively cheap, anyone spray the bottom of their vehicle? I'm wondering if that would be better than fluid film type stuff... I thinking of spraying it and leaving it (and not buffing it off since its the underneath)

Something like this,$30-$40:

https://adamspolishes.com/collections/ceramics-graphene-graphene-ceramic-spray-coating™/products/graphene-ceramic-spray-coating™-advanced

 

It would be so
Much cheaper with wool wax or fluid film

 

I'd think impossible to get coverage in boxed section of frame. Also doesn't creep like FF or woolwax

Additionally, ceramic needs an extremely clean surface to bond with

 

Ceramic coatings don't have any kind of corrosion inhibitors. "Spray on" ceramic coatings don't last very long either. Don't waste your money.