LFGSS Camper Van owners?

got a few bits and bobs of rust coming through on very bottom edge of side panels/runners on van - anyone used coloured Hammerite successfully? Thinking of doing light sanding of edges and painting - it's not really in visible areas so doesn't need to be spot on - but wonder if Hamerite alone will cure rust?

I've seen various posts suggesting using a rust inhibiting primer first e.g. vactan. Never tried it though although god knows I need to :(

I went over a rusty mini's underside with a wire brush, slapped on rust inhibitor then went over with black Hammerite. Worked a treat. I sold it, but it was years before I heard reports of a rust bubble or two.