I'm currently looking into the po15 starter kit and feel semi-confident on doing a patch repair on the affected area and then applying por 15 in the inner arches to make sure for the moment no further rust forms. I'm not in a position to get clean new arches welded in at this time and personally until any other rust forms I'm not going to consider it for now.
My question is, I clean my car once every fortnight and I do so myself as I like to give the inside of each arch a good clean to stop the usual build up of dirt and grime . Once every month or two I intend to give the car a full wax which I apply by hand. Will I be speeding up the process of the rust bubbling by applying wax to this area or am I better to avoid it at all costs?
Realistically it will be another month before I have the funds to buy all the equipment I need to prep, treat and paint the effected area. So any help and tips would be greatly appreciated

Picture below for reference (Excuse the unclean car!):
