I had to fix my 96 dp one time, it was cracked all the way up the cheek to the visor
2 part epoxy should do the trick, but use the kind that is designed for plastic...not the standard type. I think it is called "pastic weld system" and you can get it at walmart. the kind designed for plastic seems to adhere very well to the vynll, be very liberal on the inside of the bucket when you apply it. The stuff setts up very quick, but you will want to use C-clamps to hold the bucket in place while it cures. It worked very well for me, only problem is, it sands off kinda hard, so be ready to put some hours in sanding the outside smooth again
Its better than a cracked bucket though
hope that helps
Damian