Definitely second what PB's Rich has said above about the 203S - it's great on Ford paint by hand and let's be honest, if you're tackling deswirling on a full car without a machine, then it's a lot of hard work and you want to see some worthwhile results.

There's nothing more disappointing than spending hours only for the finish to look hardly any different, but with 203S you will see a huge improvement which will justify all the effort