Why not use paint protection film?
These are Brisbane based but can give you idea of finish and price.
www.ducoscratch.com.au
www.theracingroom.com.au
Melbourne based is ozicozi
www.ozicozi.com.au, whilst I haven't dealt with them I found them absolutely useless at giving a quote or answering emails, I emailed then quite a few times and rang them and they never bothered to quote despite me wanting to go ahead but others have had a good experience with them so worth a look.
The benefits are that you don't see the film except up close, it's always on the car, can protect against scrapes, is easily replaceable and doesn't look like absolutely crap like the car bras which scratch your paint as well.
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