Park claims they addressed this
https://www.parktool.com/en-us/produ...patch-kit-gp-2
We worked with 3MŽ to produce a self adhesive tube patch that stretches, flexes, twists, and turns right along with the tube.
All the glueless kits I see still come with sandpaper to roughen the surface of the tube. Does that possibly mean that the glueless patches are pre-glued with vulcanizing glue? Or just that the unroughened surface is just plain no good for adhesion