Today I repaired the damaged front bumper cover. Used SEM bumper repair epoxy and used the plastic (or fiberglass?) drywall tape as a reinforcing mesh. I sprayed on some SEM Adhesion Helper and then spread a layer of the goop over the cracks and then put on the tape and mashed it into the goop! Ha ha.
Once it was set up the repair was solid as could be. I mixed up some Bondo body filler and spread it over the exposed side of the cover to begin the refinishing and painting steps.
While it may not be the tape sold by the bumper adhesive groups, it seems to do the trick and saved me waiting for a roll of the more expensive tape to get to me as I would have had to order it from someplace as my parts store does not carry this reinforcing mesh.
The finishing work on the bumper should be done with plastic repair material instead of bondo especially if any flexing is going to happen in this area. I agree on the above^ SEM's plastic repair material for problem plastics does sand well. Pinning is also a great idea. I've also done grooves with a very low speed cut-off wheel to increase the amount of surface area in the root of the bond area with great results. If the bond is great the durability will then only be subject to the strength of the material and that's what the mesh is for.