To bond it to other things you can either flame treat prior to gluing or use a proper HDPE glue.HDPE, love the material!
You mention bond… I’ve tried lots of different ways of bonding, all failed. Plastic welding would work for the join, but not sure if plastic welding to the dish would work?
Bonding Low & High Density Polyethylene with Industrial Adhesives
Permabond has developed a line of specialty acrylic adhesives for polyethylene that form strong bonds without surface treatment.
www.permabond.com
Not done it so couldn't comment directly sorry.