£400 is a hefty price tag, i charge in the region of £100 for a full exterior detail.
Advantage of spending 8-12 hours getting your paintwork sorted is, it is easier to keep your car looking its best from minimal effort after that. I just need to spend 20mins giving my car a wash and it come up like new everytime as i have spent the time with polish wax etc
You don't need to spend a great deal of money to get your car looking good but to protect it i recommend the more money the better if you don't have time on your hands. A recent test was done on my car with various waxes ranging from £10 to £500+ on different panels and after a couple of weeks the cheaper waxes were near gone but the higher end ones are still doing a great job. the most expensive wax was applied to my spoiler and have not had a wash mit near it in 2 months.
I cannot stress enough to people not to polish their cars all the time as polish does remove clearcoat and eventually paint if all clearcoat is removed. The audi bonnet i detailed was 18 years old so had no clearcoat left on it and when i was polishing it with a white applicator pad it ended up the same colour as the car.
Good polish is also cheaper than paying a bodyshop to rectify any faults in your paint. Again the audi bonnet i done i a great example of what can be done and for those who did not see it here is the 50/50
Also some scratch removal on my Alison's clio using a machine polisher
Is spending hours on end worth it? YES