I just installed a .040 aluminum roof on my camper. Originally, the front of the roof had an aluminum termination strip-type thing across the edge. It was screwed down on the front lip of the roof. There is a plastic piece that slides on and covers the screw heads.
The rear lip did not have this. What do you suggest putting there? There were only screws there before. I was thinking a piece of flat stock or I’ve seen boat bump guards that look kind of like what I have in front.
I stapled both front and back lip to install, with putty tape between panels. Plan to putty under termination strips and screw.
Also seal all the divots with OSI gutter seal, thin layers. The front strip is common on modern RVs. Not sure why your Comet would have had that but they are used at a seam. The strip is screwed into a rafter so that the screws will grab and ooze the putty. Screwing to metal along won't work. I'm guessing you have a rafter there if you stapled the metal.
I would dry fit the strip and pre-drill for the screws, bit smaller than the screws you will be using. Be sure the screws are pan heads and sit flat on the strip. Just before screwing the strip/putty down, put a tiny dab of gutter seal in the hole. That will help seal the screw heads.
Also, before using the strip be SURE you can obtain the right size insert for that particular strip. 3/4" can be difficult to find.
Use a thin layer of gutter seal over the staples. That seals the skin divots. This is before putty. I like to pre-drill the holes to keep the putty from spinning too much. The less spin, the more stays where you need it. Once the putty is on the rail, place it on the seam, and prepare to screw down. Just before inserting the screw, place a tiny dab of gutter seal at the hole. You will need a thin pick to find the first couple of pre-drilled holes to insure the strip is in the correct position.
I would need photos of the original roof to be able to tell you what was what..