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The PR2001B2 is a quality aircraft fuel tank sealant which is unaffected by changes in humidity. As such, it is ideal for the fillet sealing of fuel tanks and a variety of aircraft sealing applications. Its service temperature range can be up to 420 degrees Fahrenheit with intermittent excursions, but will usually range from -65Ã‚Â° Fahrenheit to 300Ã‚Â° Fahrenheit. The PR2001B2 sealant is suitable for application either with a spatula or extrusion gun.