Cost estimation full re-caulking aluminium roof (16 feet tt)

It looks like some spots need removal, the caulk has shrunk away from the trim edge. I wouldn't trust just applying new sealer over that mess. If it was me (and a few years ago it was) I'd remove the old sealant and replace it with Eternabond tape. The tape needs a scroupulously clean surface to adhere. I used scrapers, a grinder with wire wheel, followed by mineral spirits and lacquer thinner. My roof is aluminum, too.