3M AC-251 Black Class B Datasheet
160°F. If the humidity is low, increasing the humidity will cure the sealant more quickly. Minimum Typical Tack- Typical Application Life1 Free Time2 Cure Time3 B-1/2 1/2 hour 4 hours 4 hours B-1 1 hour 5 hours 7 hours B-2 2 hours 8 hours 9 hours