[The Newell]

My wife and I are needing to reseal the seams on our Newell Coach. Some of the rivets have come loose or come out and I need to find out what type and where to get these rivets. Also, what is the best sealant to use? Someone told me that I should use structural rivets on the sides if I replace any of those rivets? Any help would be appreciated. Thank you in advance for your help.