Aircraft fluid resistant sealant for use on aircraft parts

An assembly for use with a spray gun, the spray gun for applying a sealant coating, the assembly comprising:

• a first compartment and a second compartment, the first compartment containing a first component, the second compartment containing a second component, the components dimensioned to engage a spray gun, and
• a mixing straw fluidly engaged to the first and second compartments, the mixing straw configured to receive and when the assembly is engaged with the spray gun and the spray gun is energized, combine the first and second components to form an uncured sealant mix and emit the uncured sealant mix, under pressure, from a tip of the mixing straw at a removed end thereof capable of curing to form a visibly clear, cured in place, sealant coat on an aircraft workpiece, the clear sealant coat being one of a polyurea, polyurethane or polyurea/polyurethane hybrid coat;
• wherein the cured sealant coat is resistant to a phosphate ester based hydraulic fluid, and also resistant to Jet A fuel;
• the resistance to the phosphate ester based hydraulic fluid demonstrated by a weight change of 1.66% or less (24-hour spray) and the resistance to the Jet A fuel demonstrated by a weight change of 0.07% or less (24-hour spray).