Wheel Arch Clean-up

[steve-45]

Whilst changing a rear wheel I noticed a couple of surface rust spots on the metal that the liner does not cover.... another job for the list !!

Looking at the liner it only seems to be held on with 4 or 5 retaining nuts, are they metal or nylon and will they undo ?

Also, after I've wire brushed all the surface rust off whats the recommended paint / rust killer to use?

I intend to put underseal over the paint to help protect it from further damage.