AC-250 Class A is a two-part, low temperature curing polysulfide, quick repair sealant for integral fuel tank and fuselage sealing applications. The mixed compound is a pourable liquid which can be applied with a spatula, extrusion gun or brush. It will cure to a fuel-resistant rubber at temperature above 20°F.

AC-250 Class B is a two-part, polysulfide, quick repair sealant for integral fuel tank and fuselage sealing applications. The mixed compound is a thixotropic paste and can be readily applied with a spatula or extrusion gun. It will cure to a fuel-resistant rubber at temperature above 20°F. AC-250 Class B exhibits excellent tooling properties.