Yeah, gtechniq C5 Wheel Armor is excellent, though quite expensive; 15ml is around 25 Euro, rated as durability of 1 - 1.5 years - theres enough in the little amount you do get to do the set of wheels though.
At the moment, there is no current supplier of gtechniq in Ireland though...Im working on it!

Another option is Wolf's Chemicals Rim Shield - for around the same price, you get 10 times as much - durability of up to a year, so, perhaps having to apply it a little more frequently, but at least you'd have it there to do it.

Do it now, before the wheels get contaminated and need a full preparation - though I would advice a light wipedown with IPA.
If you are looking for something a little easier to use, Wolf's do a wheel cleaner that contains Nano sealant in it - when it cleans, it moves the dirt out and the sealant moves in, protecting the wheels until the next time you wash and use it - Wolf's Clean & Coat