After the last couple of winters, my alloy wheels are getting quite corroded, and one of them has large flakes of the surface missing, and almost a bubbling effect in the metal.


I have read on other questions here that I could start to lose air pressure due to a poor seal so I'm assuming that at some point I need to either replace or get them sanded and re-coated, but how serious is this?
Should I do it now, or is it something that is not a major issue other than a cosmetic one for now?