dodo juice do a range of waxes that are geared towards certain colours. to be honest im not sure whats in them or how they are different but might be worth a look at atleast. for example, they do a wax called purple haze which is geared towards darker cars and metallics. when my current wax is empty im gona try that one next (although that will be in a while because the wax lasts a long time)

i just use soft foam pads for applying wax and dressings, similar to the one in your link.
http://www.elitecarcare.co.uk/meguia...cf6f4341f6199a.
you can get a 2 pack of megs pads in halfords or you can get slightly cheaper ones online from detailing shops.