[chrisbecker]

It's actually a good idea to clay a car as soon as you take delivery of it. The paint can collect rail dust (if transported by train), brake dust and other contaminants that can cause early paint deterioration. A good wax or sealant should be put on at delivery too.

 

[chrisbecker]

Is clay barring necessary every time before waxing even if the surface is 'smooth as glass'? Or is it simply a 'good idea' or 'recommended' type of thing?

It's not necessary every time. I recommend waxing a vehicle every 3 months and claying it every 6 months.