In addition to Squadron, there are lots of alternatives for Tenax. Plastruct Plastic Weld and MicroMark "Same Stuff" both come in a little bottle with applicator.

Weld-On #3 comes in a larger can and is what Adam Savage (Mythbusters) said is used by ILM and others to make movie models. They pour some in a bottle cap or the bottom of a coke can and brush it on. Straight MEK will work too.

__________________
I love sanding.