I used a kit to make some brackets and stuff.
They held together for as long as I had the bike after ( bout a year or so )
What I did like it for was for making thread in alloy .To over drill the hole fill in with weld and tap into it. Made a stronger thread.
But I didn't use it for load bearing.
BPG I think it would be grand for any of that stuff
I cant lay my hands on the instructions but it did make special mention of castings ( think it was about heating the metal )