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oem s13 bumpers are made of urethane.
You cannot plastic weld urethane- it will burn.
Repair them, using urethane adhesive glue. Urethane glue sticks VERY well to scuffed/sanded urethane plastic and wont pull apart.
Using "bondo" to hold the crack together has no strength.
I would remove the bumper, use a dremel or a really rough grit sand paper to rough up the back sides of the cracked areas- then use a hot glue gun to hold the cracks in the right spot from the front side (yes, hot glue the whole crack so it holds together).
Then use the urethane glue on the crack (flip the bumper over so that you are gluing the crack flat on the floor, not from underneath, which would cause the glue to drip etc. Then, after the glue is fully cured, use needle nose pliers to pull the hot glue off the front side. Bevel the front side using a dremel, making a groove in the original plastic. Then buy a really small drill bit- 1-2mm drill bit and drill holes in that beveled area though out the whole crack. Buy some hobby wire and stitch the crack up. Then use fiberglass filler (bondo hair, or short strand bondo hair filler) to fill over the beveled area where the stitched hobby wire is. Then blocksand smooth and prime .
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