I did mine with Butyl tape several years ago it worked out well. If you go to a hardware store they may not know it as "Butyl rubber tape" if not ask for "Metal building panel seam tape"
Below is information on using it, this fellow sells the tape also, ordering information in the article below
https://marinehowto.com/bed-it-tape/
Be careful removing the old sealant! I wasn't, mine was caulked with something very hard, knife slipped and I wound up with 5 stitches across the knuckle of my left "bird finger"!
Good luck