Odd coolant leak

[jaguar6165]

I replaced the old head with a 5.5-1 and installed a new gasket. Everything is tightened to 55lbs. I noticed some coolant pooling around the nut on the rear driver side stud. I don't see coolant in the cylinder and the exhaust doesn't look as if it's burning anything. Ran the car a few times and have tightened everything to 55lbs several times. Can I was a coolant additive to seal the gasket leak?