For a more permanent fix: Hold it together and put a few drops of acetone in the seam with an eye dropper. It'll get sucked right in and fuse the crack together. It'll hold itself after only 20 seconds or so. But this weld is prone to cracking, not good for a tumbler bowl. So follow by either:
1. Rough out the outside of the bowl with some 60 grit sandpaper, spread some JB over it, and then lay a strip of autobody fiberglass cloth over it. Spread more JB over the top of the cloth, then put a strip of packing tape over that to push the epoxy into the cloth and to smooth the surface. Remove the packing tape after the JB cures.
or 2. Use a soldering iron to fuse the bowl together by zigzagging over the seam on the outside of the bowl.
or 3: Rough up both sides of the bowl with 60 grit sandpaper. Drill a bunch of small holes along each side of the crack. Sew it up with some steel wire. Then cover with epoxy and sand smooth.
I bet duct tape holds for a long time. I wouldn't worry too much.