The next step is to fill the gap between the interior brackets on both wheel pants with structural epoxy. This is accomplished by drilling holes near the attach points, scuffing up the inside of the wheel pant for good adhesion, putting packaging tape over the attach bracket so the epoxy doesn't stick, installing the wheel pant using waxed screws, and injecting a mix of epoxy/flox mixed to a firm consistency so there are no drips. This meant taking off the wheel pants and then putting them back on before injecting the flox, but all went as planned, and then I just had to wait for the epoxy to dry.
Injections done, you can see the blobs inside the pant