Don't know about dual action, BUT Aldi or Lidl have a variable speed car polisher in at the moment,
I kind of thought most would be da?
My brother gave me a cheap Halfords one onece (that broke quite quickly) - even that was da.
There was a challenge extreme from argos which was well reviewed. The replacement seems to be the guild https://www.argos.co.uk/product/8647300 See https://www.detailingworld.co.uk/forum/showthread.php?t=412218
The essential thing seems to be to changing the backing pad and buy decent pads and polishes.
.Anyone got a recommendation for a good reasonably priced dual action car polisher?
I went for a https://www.amazon.co.uk/100371-Polishing-Machine-Motorbike-Polisher/dp/B01J6J24X6, it has done a few cars and bikes now, works a treat:
I should have taken before photo's, the Alfa was dull and grotty, the petrol tank petrol stained and marked.
a rotary machine will do the job quicker
Undoubtedly, but in the hands of someone inexperienced at this malarky it has the potential to burn through - not a good thing.
long as common sense prevails