Universal Acrylic Thinners for all Polaron products. It is not recommended to use with synthetic products. T 8-18 Fast Thinner is for use in cold weather conditions and fast jobs like spot repairs. Recommended temperature is between 8-18 oC. T 18-25 Standard Thinner is for use in normal weather conditions between 18-25 oC. T 25-35 Slow Thinner is for use in high temperatures between 25-35oC. T 35+ Very Slow Thinner is for use in very high temperatures (35 oC plus).