Scanner,
I have a white (pure) SOL with green stripes. I used Go-N-Def's "system" by hand (no Porter-Cable) and made sure that the paint was super-white and clean before sealing twice... and waxing twice.
Now I have a wash and drive car. Using his system works!!! Many on this list have seen my white car and I have 15000 miles. They are very impressed with how "white" is still is after 4 years and 15000 miles.
Nothing sticks to the paint that a good wash and a little claybar won't take off!!!
Thanks Mike for the link, couldn't have made my hazed/cloudy car look this great without you!!!