What's the watertight aircraft rivet? I think it has 'red' in the name...
Spot welding stands out as a good idea to me. The Horror Fraught spot welders are pretty inexpensive and work well. I ended up buying both the 110V and 220V versions, and found the 110V preferable (not as likely to burn through on the thin material I'd actually spot weld). I know it sounds stupid to buy a welder, but you could easily spend as much on good rivets...
GsT
Spot welding stands out as a good idea to me. The Horror Fraught spot welders are pretty inexpensive and work well. I ended up buying both the 110V and 220V versions, and found the 110V preferable (not as likely to burn through on the thin material I'd actually spot weld). I know it sounds stupid to buy a welder, but you could easily spend as much on good rivets...
GsT