I have similar issues with my SS lip so hopefully you get some great advice on the matter since I will also probably use the same techniques recommended. I have cracks and breaks and my lip seems to be barely hanging together at the joints.
yeah, its just straight up fiberglass hair exposed underneath.On the iner part.. it looks like fiberglass hair thats unsanded correcT? on the inner part of the bumper cover you don't have to sand it, but I would use a real heavy grit. On the outside or the part that is visible... just use some 400gritt to sand any weak spots off and give it something to hold on to... If for some reason, the crack gets wider from sanding, then use a light coat of basic Bondo body filler to fill the crack. Sand the outer part real smooth some filler primer and then wetsand :twothumb:
If you were in cbus ohio I could do it for you in no time.