I know nothing about rivets and riveting. Since I wasn't planning on covering any windows, I was not concerned with learning anything about them. However, I am now planning on covering the two emergency hatches and that little vent in front of the front hatch. I was thinking about covering them with some of the metal we took off the inside walls, using Sikaflex/butyl tape to secure them, then use screws, then cover edges with Dynatron seam sealer. The more I think about it, I'm wondering if I need to use rivets instead. I've read people have bought the cheap Harbour Freight one. Would rivets be better to use to secure that metal than screws and if so how do you rivet, what size rivets, how close together, and what is the difference between open and blind? Also on my front hatch where there is a leak, there is a rivet missing. It makes wonder if it might make it more secure to use screws.