All materials
Material
Polypropylene (PP)
Storage bins, bottle caps, food containers, garden furniture
Default glue
Plastic bonding system (primer + CA)
The primer pre-treats PP's waxy surface so the adhesive can grip — ordinary glues can't.
Identify
How to tell it’s polypropylene (pp)
Slightly waxy feel, and it flexes instead of cracking. Look for recycling code 5 or the letters 'PP' molded into the plastic.
Character
What it’s like to glue
The problem plastic. Its waxy, low-energy surface sheds ordinary glues — epoxy, super glue, and wood glue all peel off. It needs a specialty primer system or a mechanical fix.
Alternatives
Other glues that work on polypropylene (pp)
AvoidOrdinary epoxy, super glue, or wood glue — they all bead off polypropylene without a primer.