I was thinking of buying some to repair a hole in my K75 valve cover, currently partially filled with liquid metal .. its always seem to seep oil though.
Just priced a new cover at $392 or $420 (schwartz), been looking for a 2nd hand one for a while.
Problem though, I think the covers are magnesium, I grabbed this from the Australian Durafix site.. http://www.durafix.com.au/index.php?content=faq.htm
Is the item you are trying to weld melting before the rod?
I would take a guess that the part that you are having trouble welding has or may have a Magnesium content. The item to be welded may start swelling or just fall apart when heated. I have welded the door strikers on my 38 ford, having to hold the heat back and bring it up to temperature very carefully and then back the heat off as soon as the rod adheres...a very fine line as it starts to bubble and pop as the muck/magnesium within explodes. Supporting the item or encapsulating the outside walls will stop the item falling apart.
You can use durafix as a casting rod...use casting sand, exhaust putty or mild steel (panel-steel) as a mould or support.
My saying is "if it's pure magnesium - glue or chuck it out!
Back to square one .. anyone got a K75 valve cover they don't need ?