I've just fitted some of these,2 of my wheel arches had just bubbled through in a few places and rather than spend hours trying to get a pro finish i just rubbed em down treated the metal with rust converter and primer and fitted these over the top.
http://www.ebay.co.uk/itm/BEST-OFFE...arts_Vehicles_CarParts_SM&hash=item35ba507fad
i used sikoflex and clamped them till they were stuck firm, you need to do a bit of bending but nothing major i didnt used the fixing strips supplied , the finish is good, i went for the black crackle finish which goes well with the existing trim.
http://www.ebay.co.uk/itm/BEST-OFFE...arts_Vehicles_CarParts_SM&hash=item35ba507fad
i used sikoflex and clamped them till they were stuck firm, you need to do a bit of bending but nothing major i didnt used the fixing strips supplied , the finish is good, i went for the black crackle finish which goes well with the existing trim.