Discussion
You don't need another coat, but it would do no harm... 
After that, maybe no more is required than a spray sealant style 'protection detailer' such as Zaino Z8, Meguiars Ultimate Quick Detailer, Dodo Juice Red Mist, to name but three. I would suggest an Autoglym one but I'm not sure they do something of that type (yet).

After that, maybe no more is required than a spray sealant style 'protection detailer' such as Zaino Z8, Meguiars Ultimate Quick Detailer, Dodo Juice Red Mist, to name but three. I would suggest an Autoglym one but I'm not sure they do something of that type (yet).
I am not familiar with Aquawax, but my understanding is that these are wax products you dilute with residual rinse water on the car; I am a bit suspicious of any wax product that 1) dilutes and 2) dilutes with an imprecise amount of water as an accurate dose can't be assured.
I'm sure it's fine to a point, but why not dry it and just apply another coat of AG Hi-def wax?
I'm sure it's fine to a point, but why not dry it and just apply another coat of AG Hi-def wax?
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