Use caution when using any of the "rust proofing" products.

The spray on stuff is fine if you use it for what it is made for. Sound deadening and rust protection for surfaces exposed to external contact with rocks, chemicals, etc.

It is NOT rust proofing to be sprayed willy-nilly beneath the car and can cause more harm than good.

The "Kiss of Death" for all old Mercedes!

I believe the wax based product is called "Waxoyl". If applied incorrectly it will cause the same problem as the Ziebart.

https://www.waxoyl-usa.com/

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now