This is the part I was considering trying that stuff on, die-cast aluminum intake manifold and aluminum tube.
http://rides.webshots.com/photo/2148285310080251109xuupWD
Here's the result of plain old TIG welding, it was a little difficult but turned out in the end.
http://rides.webshots.com/photo/2932753890080251109kYwDVV

What I continually read about the alumiweld type stuff is for low quality aluminum or die-cast parts that didn't have any strength to start with and you don't expect them to after, and then it just might be a good solution.
But for aluminum that can be welded in any other way you'll be miles ahead to actually weld it.
Supposedly it's quite difficult or near impossible to try the alumiweld and them remove it and do a good weld, so always try welding first.

In summary what I found was it should be considered a last resort after everything else won't work, but not a first choice.

Again, I haven't tried the stuff although I briefly wanted to then after some research it didn't seem like such a great idea after all.

Grigg

P.S.
Billy, I suppose there's a chance I can weld your inner fenders although I don't feel confidant about it and they don't seem like the sort of thing that allows second chances...


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-