I'd sooner have a faided bonnet than spray my Z with nasty acrylic aerosol paint. Not to mention aerosol reacts more than 2k. IMHO, you're better off saving your cash, prepping the bonnet yourself and taking it to a bodyshop to get the bonnet and tops of the wings blown in.
TBH, if you prep it yourself and take it to a bodyshop, you'll not spend much more than you would purchasing 20 odd cans @ £5 a throw to do the bonnet yourself with nasty paint.
BUT, if I were you, I'd look at getting a detailer to inject some life back into the bonnet....and then keep on top of it by looking after the paintwork after!! For example....a top detailer I know, got a 968 from this...
To this....
Before bonnet...
After