I have searched and have not found any information about what is actually causing the cracks in the hood insert. I used to do fiberglass repair and I was wondering which way to tackle the cracks. I have thought of two approaches to fix the problem. One approach would be to grind out a "V" groove in the cracks from the top and then refill that groove with resin and chopped up fiberglass. The other approach would be to take resin and glass fiber to reinforce the bottom of the insert and then fill the crack with glazing putty. Has anyone done either of these fixes and did they last?