Fixing a cb6Ks

I’ve been using a cb6Ks for half a year and have spotted a minor issue. I previously sanded down any rough patches, especially along the underside seam of the cage tube where it enters. Lately though, that area looks a bit “open,” which is causing skin irritation.

I’m considering filling it in with some glue or epoxy to smooth it out.

Any advice on what type of adhesive works best would be great. Thanks!