Backstory,

12 months ago I had to replace the cylinder head on my courier ute, Repco salesman recommended and sold me some Permatex No1 for the gaskets/cover plates etc.

I soon noticed that wherever it was in contact with oil or coolant it was breaking down into a mess of brown goo and fluids were weeping everywhere it was used, and the places it was subject to heat it turned brittle and fell apart.

This weekend I had to pull the head because of a big coolant leak up under the intake manifold, it appeared to be pouring out of the head gasket and on inspection I found the head gasket was blown (as expected)

The strange thing is, I found a mass of coolant soaked brown goo inside the bottom of cylinder 3 intake port, near the crack in the head gasket.

I can't figure out how it got there and if the two are related, hope I'm not just treating the symptom instead of the real problem by putting a new head gasket on
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