Is there a way to reseal a leaking intake manifold?

Clean the area of the leak REAL GOOD with MEK, Acetone is fair, but MEK is what's best. Mix the 8802 B 1/2 (B=brush able and the 1/2 =30 hour cure.) The kit comes with a ram rod which injects the catalyst into the sealant. By pulling back the plunger all the way and inserting the ram rod into the plunger, push the catalyst in. Mixing is done by stroking the plunger in and out and turning it clockwise, until the sealant appears to be one color in the tube. (usually 40 to 50 strokes) Unscrew the plunger and use a caulking gun or a hammer handle to push the sealant out onto a clean surface (mixing board, coffee can lid) using a "disposable brush, liberally apply the sealant to the area of the leak. Let it set for at least 24 to 30 hours. (full cure) We use the product in the aviation industry, for fuel tanks. I have sealed many oil leaks on aircraft engine crank cases with it. It hardens to a flexible, rubber like substance and yes! Very much like Flex-seal. CHEMSEAL B 1/2 TANK SEALANT CS3204B1/2 | Aircraft Spruce