Got another question. For a new car that the dealership probably waxed. Do I need to use paint prep like Griots paint prep following washing/ironx/clay and before using Griots Finishing Sealant?
I would. It adds 15min to your process at most and will guarantee that any leftover clay residue, wax etc. is gone and you're working with as clean a surface as can be.
Think putting purell on your hands after rinsing off Gojo.