There was a thread a couple weeks ago showing a video of this new way of fastening, described by the manufacturer as "welding". I couldn't find the thread using the search feature. But perhaps you can google Bondic if you didn't see the video. I bought a kit, and have used it on this diesel pictured.
It had suffered extreme crack damage, even taking away part of the plastic nose, as you can see. I used the Bondic as instructed, and the repair went very quickly and seems to be holding fine, having been frequently handled to fill remaining defects with JB Weld and Testor's putty.
I wouldn't describe the process as welding, because it leaves a raised trail of adhesive, like hot glue would, but narrower. And there is more to the process than what the video shows: The blue light should be used for only 10 seconds at a time and at a distance of 25" for safety. This is OK though, as you need to be up close only for squeezing out the stuff. Only areas that can be reached by the blue light can be joined, i.e. no internal joints.
All in all, I would say that it certainly has its uses, with the main advantage being that you have plenty of time to position your parts without worrying about glue setting up. There is no hardening until you choose to apply the blue light.
