would you bother with having a rust inhibitor applied to a new car in coastal regions of Qld either electronic corrosion inhibitor or a corrosion coat applied.
Is it worth the wonga ?

How much? How long are you intending keeping the car? Husband has just welded a new floor on his ute, it's 20 years old and spent the first 10 years in FNQ.

No I wouldn't bother.

Cheers for that
It's a brand new toyota carrola so was not sure what to do.Also is it worth paying for paint protector coat ? or is it the garage trying to plug somethink that's not really needed.

Paint protecter? Will that stop trolley and car door dents in the side of your brand new car gained from parking in shopping mall carparks?
I'd invest in a max n paddy style alarm instead "get back ya bastards or I'll break your legs"

Paint protector is good for stopping bird/bat droppings from eating through your car, and protecting it from fading. you do have to renew it every 3 years though.