All the sealing compounds covered by this specification are intended for use as multi-purpose aircraft structure and fuel tanks sealants with rapid ambient and low temperature curing capabilities without sacrificing application life. As an example, cure time at any given application time for these materials is approximately 80% less when compared to a two component polysulfide fuel tank sealant. These sealants give "fly-away" capability in 2 to 3 hours when cured at temperatures of at least 75° F. When cured as low as 40° F, these sealants provide a 4 hour "fly-away" capability when using ¼ application time material (see 1.2.3). They will also cure at lower temperatures for example 20° F (−5° C) at proportionately longer periods of time. These sealants will also cure rapidly in low humidity desert environments. Type II materials are intended as protection for metal and dissimilar parts against corrosion.

Type I, grade A-1 sealants can be cured at elevated temperatures immediately after application and are suitable for composite co-cure bonding procedures in manufacture and repair processes. Direct heat at temperatures of up to 350° F (176° C) can be applied by heat gun or blanket immediately after sealant application.

These sealing compounds are for use in areas that may be subjected to long term service temperatures of −85°F to +285°F (−55°C to +140°c) and short term exposures in the +400°F (+204°C) to +420° F (+216°C).

These materials have outstanding resistance to mercaptans present in fuels and also can withstand heating in a confined structural configuration.

The sealing compounds have a minimum shelf life of 12 months when stored at temperatures below 80°F. In addition, the 12 month shelf life can be extended by storage at refrigeration temperature (approximately 40° F).

The sealing compounds furnished under this specification are to be used with the manufacturer's recommended primer to obtain optimum results of adhesion to all surfaces.