Yes, folding knives can be used to cut fiberglass. Fiberglass is a relatively soft material, and a sharp folding knife can easily cut through it. However, its important to remember that cutting fiberglass can be abrasive and may dull the blade of the folding knife more quickly than cutting other materials.When using a folding knife to cut fiberglass, ensure that the blade is sharp and in good condition. Dull blades may cause splintering or fraying of the fiberglass, resulting in a rough cut. Its also recommended to wear safety goggles, a dust mask, and gloves to protect yourself from any debris or particles that may be generated during the cutting process.Take caution while cutting fiberglass with a folding knife, applying steady pressure and making controlled and deliberate cuts. It may be helpful to support the fiberglass material on a stable surface or use clamps to secure it in place before cutting to ensure clean and precise cuts.However, for large or complex fiberglass cutting projects, its advisable to use specialized tools designed specifically for working with fiberglass, as they may provide more control and efficiency. Additionally, if youre not experienced or comfortable working with fiberglass, its a good idea to seek professional assistance.