Which two hazardous chemicals are involved when working with polyester resin?

• A. Toluene and methanol.
• B. Ethyl acetate and xylene.
• C. Styrene and acetone.
• D. Water and soap.

Answer: (C)

Polyester resin systems rely on a volatile solvent that acts as the monomer and helps with mixing and curing. The two chemicals you’ll most commonly need to manage safety for are styrene, which provides the reactive solvent component, and acetone, a frequently used thinner and cleanup solvent. Styrene vapors can irritate the eyes, nose, and lungs and pose longer-term health risks, while acetone is highly flammable and also irritates the skin and eyes; both evaporate quickly, so good ventilation and appropriate PPE are essential.

Other solvents listed may be used in various coatings, but they aren’t the pair most specifically linked to polyester resin in typical safety guidance. Water and soap aren’t hazardous in this context.