Here is my way of restoring cracked 69 barracuda plastic grille surrounds.
Source for the JB Weld Bonding Agent: Lowes or Home Depot. Around $6.00
The JB Weld Plastic/structural bonding 2 part agent works very well and is strong. I used Krylon Dull Aluminum paint to spray the headlight plastic bezels and the plastic surrounds.
After sanding the plastic bonding agent smooth, use a good primer to cover the bonding agent to avoid it bleeding through the final paint. I still have the other surround to complete. As soon as, I finish both of them, i'll post final photos. So far, it's looking good.
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