Polyamide hardeners are a category of curing agents employed in epoxy resin systems. Polyamide hardeners are known for improving flexibility and adhesion of the epoxy after curing. Hardeners of this type create a cross-linked macromolecular network with epoxy resins which is mechanically durable. These hardeners possess some resistance to water and a few chemicals, making them applicable for marine coatings, concrete repair, and multi-purpose glues. Polyamide hardeners allow diversification of epoxy-based products tailored to specific industrial requirements.