their are numerous compounds out there all depends on personal preferance really im a painter by trade and i usually like to you farecla g3 liquid compound first to burnish the paint up to a gloss first then followed by a swirl remover/glaze then lastly a liquid hardwax ontop for protection. I use autoglym products for polish and wax as they hold up really well and are easy to apply.
When cutting and buffing break down the panels into small sections
try not to stay in the same spot when buffing spread the pressure over an area of 30-40 cms otherwise you can heat the panel up and it can warp or you can buff through the paint and mark it.
hope this helps