Delrin is made from acetal homopolymer resin. It is a Polyoxymethylene plastic. Some glues on the market will be ineffective to use on Delrin as it requires heat in order to bond. Delrin is rigid and resists chemicals and water, although chlorine has proven to eventually corrode it.
Epoxy is a thermosetting polymer that is suitable for Delrin. There are many brands of epoxy to choose from. Epoxy comes in two parts which must be mixed before use. Some epoxy products are toxic if you get them in your eyes or mouth, so check the safety labels and have safety equipment (safety glasses, gloves, face mask) on hand in case you need it.
Gorilla Glue is an example of a waterproof polyurethane adhesive. It’s an all-purpose glue and is fast drying. Once applied, you have around 10 to 15 minutes to work with it. Caution must be taken when using Gorilla Glue as it attracts animals. Once ingested, it swells and usually requires surgery to remove.
Poly-Zap Multi-Purpose Formula for Specialty Plastics is a cyanoacrylate which can be used to glue Delrin and any other difficult to glue plastics. Poly-Zap bonds within seconds, so work quickly if you choose to use it.
When Gluing Delrin
Always take care when using glues that create a chemical reaction. A disposable mask is recommended due to the heat and chemicals produced during bonding. Plastic bonds more effectively if pressure is applied; a heavy object will aid in this process.