I have the same stuff and tried it on my clutch cover and it didn't work at all. The propane torch couldn't get it hot enough to make it stick. It stuck great to the little piece I was trying to weld on although.
you would have to tin it properly.. if propane isnt hot enough use mapp..
im gonna get some and fix a hole in a case ill let you know how it goes..
http://www.youtube.com/watch?v=StzZh8V1Kiw
I should get a mapp torch because the rods are sitting in my garage collecting dust right now. How much does a bottle of mapp and a nozzle cost anyways?
EDIT: Never mind, a bottle cost $12 and the cheapest nozzle at Canadian Tire is $45.