No need to dry them off or cool them , just like Squeaky said ,
the par boil with chips or fries might only be a couple of minutes , it just helps the oil to stick
go to far and it ends up mush , I've found an atomiser spray bottle to be great for applying the oil sparingly ,
you really only need them coated to begin , then as they cook you can hit them with more misted oil as required ,
Theres all kinds variations on the theme , if the potatoes are new , skinz on wedges are great, onion powder , thyme sprigs and a veg/sea salt seasoning powder(A,Vogel) , from there you could add chilli and extra herbs also .
Of course the big variable in all this is the quality of spud , here in Ireland we have plenty of old world variety potatoes , slightly smaller ,more irregularly shaped and dimpled than for instance Roosters ,but flavour and texture are hard to beat .