Loctite Super Glue All Plastics, Strong Plastic Glue, Easy to Use Instant Super Glue, Convenient Size 1x2g + 4ml & Glue Remover, Effective Adhesive Remover for Correcting Badly Bonded Items, 1 x 5g

This does exactly as it says. The activator conditions the low energy plastic ready for bonding and it is this that works its magic. I tried it with standard superglue with the same good result - So keep the activator if you have any left once the tiny tube of glue is gone. Used it on PP + EPDM (Polypropylene + Ethylene Propylene Diene Monomer) car bumper to a crack repair and it is holding up well. I tested it on an old part off the car and the bond was unbreakable. Without the activator it just crumbles. If you're struggling to get a certain type of plastic to stick with a good bond this will probably fix your problem for sure!