Whoa... no disrespect to the fellow that made the VAP video, but I think he was just showing what and how they work, not the how to actually use them in practice.
A previous repair to my trailer was done using Olympics with no sealant with the rivets and I can assure you that is a disaster. I don't know how many years ago the repair had been done but I do know that butyl was used around the windows and it had hardened and shrunk allowing water to course through and then along the overlaps of the side panel they had used some sort of foam tape and the foam had degraded allowing water through. I ended up pulling the whole side off the trailer and reseating everything.
I used Sitkaflex 221 grey. It works awesome but the Trempro Frank mentioned would be great if you can find some. Here is my video on how to use Olympics properly.
If you have clear access to both side of the material buck rivets are the way to go they seem more stable and are way cheaper.
Also do a search on the forums for the show me you patches thread and have fun with it.... who needs a boring square patch :-)
But most importantly have fun and enjoy your trailer :-)