Get down to Halfrauds. They do a superb range of aerosols, albeit a bit runny. The colours almost match up with VW originals so win win!

Having said that, if you can get the dent repaired paintlessly, your car will still look original. Paint can be a 'mare to match up. I'd try it as prviously advised, if it doesn't work, dont pay the guy and go back to getting a new bonnet.