The AMS 3277 specification covers rapid-cure polythioether sealing compounds developed for integral fuel tanks and general-purpose aerospace applications. Its polythioether chemistry allows for significantly faster curing times and enhanced thermal stability compared to standard sealants, with an operating range of -65°F to 320°F (-54°C to 160°C). It is divided into Type 1 (requires an adhesion promoter) and Type 2 (does not require one), making it ideal for maintenance repairs that require quick aircraft turnaround.