I don't rate the Poorboys wax, it doesn't last very long and other waxes in the same sort of price bracket offer a better finish and greater longevity.
This is similar in price and does a much better job, especially if you have a metallic finish.
http://www.cleanyourcar.co.uk/wax/chemical-guys-xxx-hardcore-paste-wax/prod_132.html
chemical guys xxx is regarded as having a similar finish to poorboys natty's paste wax, but with even less durability