OK, some people have asked for some more info on 'what is Tamiya's thin glue like in comparison'... here's a bit of a run down:
Glues - they act as a glue, leave a substance in the joint that sticks the parts together. There is some bonding and softening of the plastic, but still pretty much a compound.
Tamiya's 'Ultra-Thin Cement' fits into this, and is still a glue. However, this is VERY thin, and runs uses Capillary Action to draw the glue into the seam, rather than lying on the outside. This results in a very good coverage of the glue.
On the side of BONDERS, such as Tenax, they are a bonding agent that melts the plastic, and then evaporates. If you use a normal paintbrush to put it on, it leaves a dry residue you can just flick off the brush. If you have a spill, just leave the part to dry, and the surface will be unmarred - but don't touch while wet, as said previously, you will have nice fingerprints everywhere.
Again, the easiest way to apply is to use cappillary action to draw the liquid into the joint.
Word of caution - these are extremely carcinogenic in nature (cancer causing) - use VERY well ventilated rooms, and avoid skin contact. In fact, Tenax has a huge warning label on it about this (Apparently only causes Cancer in the state of California? Go figure...). It is however really good stuff, so it's worthwhile looking at. Don't know about getting it airmail though - probably sea-mail only.