Hi everyone, I'm new here...

Need some advice on the following:
Collecting my new Latio this coming week, but would like to ask about this anti-rust coating/treatment thing. The sales guy recommended me to do this 'undercarriage rubber protection layer' to guard against rust and sound dampening (wheel arcs). I've paid up for it already, list price is $385, but I'm having second thoughts.
It's quite contradictory as he first mentioned that all new cars are already 'factory treated', Borneo and Kah Motor also told me the same thing for their cars, but now he's recommending this 'added protection' layer. So would like to find out if anyone here has also gone for this rubber spray, especially new Latio owners (seems like last time don't have such thing from Tan Chong)?
Thanks!
