Xylene FX is primarily used as a thinning agent in many applications within the coatings industry. Sold in 5 Gallon Buckets. Acetone FX and Xylene FX is also used in some of our more popular topcoats to thin (Where allowed) and reduce flashing in hot regions. Be sure to use proper PPE and get plenty of ventilation before use. Xylene FX is one of the most common chemicals produced in the United States.