Glues in general do not stick to Nylon, Delrin (Acetal), Polypropylene (PP). There might be some special glue that might work better, but you should in general avoid using these plastics if you plan to glue them or apply finish to them.
When you buy the 5 min epoxy from the hardware store, the mixing stick it comes with is made of PP. After the epoxy cures on the mixing stick, you can pop it off with your fingernails. The same thing will happen with nylon.
ABS glues fairly well.