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PR1750B2 is an integral fuel tank aircraft sealant because it can stand up to extreme heat. Used for fillet sealing on fuel tanks, PR1750B2 can also be used on other aircraft parts that see extreme heat. What is great about PR1750B2 is that it remains strong and durable under pressure, not succumbing to exposure from oil, water or fuel. The PR1750B2 paste cures at room temperature and is perfect for all aircraft substrates.