Product review (5 stars): Complete kit, plenty of glue.
This kit is complete with the glue.  It's works like contact cement.  (There's probably enough glue for half a dozen seals.)

If you allow the glue to get tacky per the instructions, it works well and doesn't slide around.  That also means you have to get it right the 1st time.  The seal is just the right circumference, so you have to pull it tight to make it fit.

I put the seal in place dry and clamped with half-a-dozen small spring clamps.  Then lifted a section and applied the glue, waited and stuck in place.  It was easier than I feared, but took a while.