About a year ago my 2016 manual transmission Impreza hatchback backed into another (parked) car and as a result the rear bumper has a small crack a few inches long with about a .25 inch separation between the edges. I think the bumper is plastic, definitely not metal.
I don't care about the appearance and I'm not aware of any structural issue, so I did not replace the bumper. But, I did think that I should seal it from insects and moisture so I've been putting duct tape over it (and you can see the adhesive residue from these multiple applications).
Unfortunately, duct tape has to be reapplied every few weeks/months.
Is there a better way to seal this crack?
Thank you for your help.