I had a difficult repair a few months ago... had it in my head that the low temp aluminum "welding" rod like you're talking about was going to be the perfect solution..... did a lot of research only to find that those rods aren't nearly as special or handy as they want you to believe.

I think when it comes down to it yes they have uses but if there is any way to weld the part for sure do that before resorting to the low temp stuff.

For my project I couldn't find any that was cheap enough to feel like it was worth a try so I tried welding again and fixed the part quite nicely... should have trusted myself to start with.

•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
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-