PRC Desoto - PR-1197 Secondary Fuel Barrier Coating - Pint PA-2170TH you probably have noticed that

you probably have noticed that you have some valve guide metal in the reamer flutes afterwards

resilient rubber  with excellent adhesion to aluminum

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PRC Desoto - PR-1197 Secondary Fuel Barrier Coating - Pint PA-2170TH you probably have noticed thatPRC Desoto PR 1197 Secondary Fuel Barrier Coating Pint PR 1197 is a sprayable, polyurethane coating designed for use as a secondary fuel barrier on aircraft integral fuel tanks. The product is typically applied to the exterior surfaces of the center wing box tank. Should a leak occur in the tank's primary seal system, PR 1197 will aid in containment of the leak and prevent fuel migration. The uncured material when mixed is very thixotropic which