Hi all - I have a Citroen Relay van that I'm currently converting into a camper, and over this year some rust has progressively got worse along the top of the stainless door runner. I bought it as an ex fleet vehicle that had been sitting during covid and my guess is that it was resprayed in a rush and I didn't spot it, and it's now coming back (you can see the touch ups in some of the photos I've attached). It looks like standing water between the rail and the body have corroded over time (not sure how but hey ho). The rail can be taken off from the inside and thankfully I haven't got too far on the camper so still have access - but it is a ballache to do, and I'm wondering how far I go with this before I reach a stage where I can't access it at all due the camper walls and furniture being up. I have no real proper bodywork experience or the gear, so this would be a case of me taking it somwhere but I was hoping for some advice from some kind folks before I do so I know what to ask for or expect. I've spoken to two companies so far; 1 said that they'd just use a Dremel and remove the rust and respray it and there's no need to remove the rail. They've said that once they had a bead of silicon along the top of the rail the water won't get down so if there's any existing rust down there it won't get worse as it won't get wet. A second I've spoken to said the rail needs to come off and the while thing needs sanding back and respraying (we have no way of knowing if there's rust behind the rail). It's worth noting that it's possible that i'll be wrapping this portion of the vehicle with vinyl, so I'm wondering how necessary a respray is. Or, even if I could just sand the rust parts flat, put vinyl over and reseal and leave it knowing it won't get more wet. Would love to know some opinions on this - thanks so much. And apologies for state of van - it's very dirty, it's just the rust bits that are the issue, the rest is just me being too busy to give it a proper clean!