Did this over the last weekend, took all 5 pcs of a 4th gen tail and fused them into one piece. Thought you guys might like to see &/or try it. I just have parts pics right now, I'll add some tool and product pics a little later. I used my trusty Dremel with a round cutting bit to groove the seams, and the PlastiFix is made by Urethane Supply Company. The process is tedious, but this is the strongest/most solid plastic repair method I've used yet.
Started w/ the left side tail panel, and clamped the lower rear piece to it. Grooved it w/ the Dremel, and added the tape because it wasn't sitting perfectly with the vice grip alone:
Add PlastiFix:
15 min later... Strong!
Lather, rinse, repeat. I added the right side tail panel next(along with bolting the top center piece in place):
Then fused in the top center, and then the half moon. Taillight is bolted in place for support.
You can see I fixed a crack in the half moon piece too.
PlastiFix: http://www.urethanes...&Category_Code=http://www.urethanes...stifixhowto.php