That’s a popular method on quite a few vehicles around here. Line-X (or whatever brand they choose) the entire vehicle! Even with multiple colors!
It was probably 4 or 5 years ago at the Las Vegas SEMA show, there were about a dozen vehicles on display with full coverage on them. They also had various accessories (running boards, bumpers, racks, etc) done with it too.
I’ve seen quite a few aluminum boats with it on the interior to help with traction so they don’t slip and fall overboard.