Features and Benefits: HIT.8421-25 is a fast activator for HIT.8420-5. This activator when used with HIT.8420-5 is compliant in all states. Easy to use, great results, all at an economical price. Recommend to be used in 60-75 degree spray environments.Mix 2:1 with HIT.8420-5 | Fast Dry | For use in spray conditions of 60-75 degrees | 50 state compliant.