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Suggestion
Aftermath is right but I would like to add a suggestion to his answer. Because this part is subject to wind, vehicle vibration, etc. it needs to have it's structural integrity regained and then maintained while subject to these forces. I would suggest that you:
1. Put a wide angle V cut in the cracks (about 1/4" beyond each side of the crack) with an angle grinder and a heavy grit paper (36-50 grit will work fine).
2. Stick a piece of duct tape to the back side of the crack to stop any resin from leaking through.
3. Cut out a piece of fiberglass mat just big enough to fit in the bottom of your V crack (against the tape).
4. Cut the next piece slightly larger and place it on top of the first.
5. Continue to do so until you have enough layers to fill the crack.
note: the idea here is to mimic the original lay of the glass so make sure you're not wrapping the edges of your mat up the sides of the crack.
6. pull all of the mat out of the crack.
7. Mix up your resin and apply a thin coat to the repair area.
8. Put your smallest piece of mat into place, resin it and repeat until all pieces of mat are in the crack.
You should build your glass slightly higher than the finished surface and sand it back down to obtain maximum strength.
9. After finishing the top side you can pull the tape off of the back side of the bumper, scuff the area with your 36 grit paper and resin a single layer of mat (approximately 1/2" wide) over the back side of the crack, this will ensure that everything stays put.
If you have any questions feel free to PM me.
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