Question: We have a number of unsaturated polyester parts (fiberglass) that we need to bond for indoor applications. Some of them need very fast fixturing and short cure times, while others require a lot of time for assembly before the adhesive cures. What do you recommend?
Answer: Historically, epoxy adhesives would have always been used for this sort of application. They offer good bond strengths on thermoset plastics like unsaturated polyesters. However, in recent years, reactive acrylics have often been the choice for this sort of application. These adhesives do not have the extreme heat resistance or fluid resistance as epoxies, but are more than adequate for most applications. They are also tough adhesives with good impact resistance.