Rustproofing Repairs

hit your patches with a wire brush and a sanding disc on an angle grinder to get clean, hit it with dioxdine wipe on let sit for a 5 mins, then wipe off with thinners on rag, surface should be rough, but not overly, just enough for mechanical adhesion, light coat of a good quality primer, then some paint/ wax guard, stone guard, and some colour paint, that should fix your problem.

I hope this helps, i know its a bit labour intesive, but no rust is better ta\han some rust