Dibutyl fumarate is primarily used as a plasticizer in the production of polymers and resins. It enhances the flexibility, durability, and workability of materials such as PVC, making it suitable for applications in coatings, adhesives, and sealants. Additionally, it is utilized in the formulation of inks and paints to improve their drying properties and adhesion to surfaces. In the cosmetic industry, it serves as an emollient and skin-conditioning agent in personal care products. Its ability to act as a cross-linking agent also makes it valuable in the synthesis of certain specialty chemicals and industrial coatings.