Curiously, I was thinking of making a post on this same topic; Rapid Fix. Its truly is amazing stuff.
On our return from Q-Ball's we camped and set up the awning on my camper van. A huge rain storm in the middle of the night collapsed it. A fairly complex plastic swivel piece broke in numerous places and small bits of plastic were lost. I put the remaining pieces together as best I could, and filled the missing parts with the Rapid Fix powder and glue. It hardens immediately and I was able to file off the excess. I've been using it since with no problems.
In the same collapse, an aluminum rectangular rod was bent. On straightening, the aluminum was cracked and almost broken through. I tried aluminum brazing rod and it wouldn't stick. I used Rapid Fix. Filled the cracks, blobbed it up like welding and filed it down. Works perfect.
Since then I have used this stuff on all sorts of repairs. We temporarily fixed a leaking copper plumbing pipe (temporarily only because Lauri is and ex-plumber and insisted on doing it right). I used it to fix a 5 inch crack on my plastic bumper on my jeep. I used it to glue rubber to steel on my bass post. Lauri glued a stainless steel knob on a stainless steel kitchen canister.
The short version: if you need to glue something and you figure nothing else will work, use this stuff. It is truly amazing.
Peace & Grease, Dennis
