Depends on the extent of the spray.
If it's different colour + you want an engine bay spray and even boot etc. etc.
Can be upwards of $6,000-7,000...
Same colour and just say most of the car is ok AND it's a flat colour (non-metallic) you can be looking at as low as $2,000.
I've been told that if the large surfaces (ie. bonnet, roof) are ok - could be a fair bit less.
Guys who say $1,500 is perhaps getting on the dodgee side.
Unfortunately mine is spark silver and it's gonna cost an arm and a leg.
T.