Has anyone had a go with this stuff?

http://newtechnologyproducts.net/aluminum_repair.htm

The video looks very impressive if its for real.

Sounds like a development of the Lumiweld/Technoweld products that I have used.

They work really well, only minor fly in the ointment is getting enough heat into larger objects. The Aluminium object you are trying to make/repair will transfer the heat away from the joint faster than you can get it in.

I resorted to using two torches, one to just generally heat the object and the other to apply direct heat into the joint. I still managed to create the intake ducting for my engine. Have a look at the picture below;


VW Polo rad - check!

looks good, were you using normal butane torchs

Yup - good old plumbing torch from B&Q or similar.

I did manage to melt the parent metal at one point. I then had to cut the joint back and begin again.

All in all it took about 2-3 hours to create a 75mm diameter tube, with a 60 degree corner in the middle, from <1mm thick Aluminium sheet.

I also made an adaptor to go from the round inlet from the cone shaped airfilter to the square inlet for the air flow meter (it's fuel injected). This took longer because it was 2mm thick in places and the heat transfer problem was MUCH worse. This was when I had to use two gas torches to get the heat into the component.