Which type of resin is typically less expensive but less durable?

The correct choice is polyester resin. Polyester resins are typically less expensive compared to other types of resins, such as isothalic and thermoplastic resins. They are widely used in various applications, including boat building and automotive parts, primarily due to their cost-effectiveness. However, polyester resins are known for having lower durability compared to options like isothalic resins, which exhibit greater resistance to environmental factors, chemicals, and mechanical stresses.

In comparison to the other types of resins, polyester resins may not provide the same level of structural integrity and longevity. This characteristic makes them suitable for projects where budget constraints are a significant factor, but where ultimate durability may not be critical. Understanding the trade-offs between cost and performance is essential in selecting the right resin for specific applications.