404 Tooling Polyester Resin – Isophthalic provides superior strength, low shrinkage, and excellent heat resistance, making it the go-to choice for composite professionals. Its dark amber/purple tint ensures consistent coverage and visibility during layups. 

Perfect for:

• Fiberglass mold construction

• Marine applications (boat hulls, tooling plugs, repair work)

• Projects requiring durability under heat and stress