Neither on Diamond white...

Polish with ClearKote Vanilla Moose Glaze (confusing name admittedly, but it is a polish)

Seal with Poorboy's EX-P

Wax with Optimum Car Wax.

Stay away from heavy carnauba waxes and glazes, they don't suit white cars. The above line up gives a great finish on Diamond White Give the car a good claying session before you start if you've not done this before.

Gareth