I'm surprised at the amount people saying Moonstone is a problem! If any paintshop has to ask the customer what shade to use on their car then the thing should clearly not be there as thats just worrying.
Yeah there are a good few shades of Moonstone but there are far far more difficult colours out there to master. Take Ultimate silver on the Nissan GTR for example £700 a litre and has to be applied like a chrome effect now that is a colour to worry about not an old 80's Ford colour.
It's being blown way out of proportion get it to a decent paint shop walk away job done.
Sorry lads but had to be said, to many threads like this just end up causing more worry than they ever need to.