I just bought: Hebco Tenax-7R Plastic Construction Kit.
its an adhesive kit for plastic models, it is the best i have ever used, its expensive at 16.95$ but if you are into building models, this is the only way to go.
this glue LITERALLY WELDS THE PLASTIC TOGETHER IN TEN SECONDS!!!!
I recommend getting this because you wont be disappointed at the results

its available at most hobby shops and online as well at TowerHobbies.com