Leaking thermostat joint

[squish]

Sorry if this has been covered before - it didn't come up in my searches.

My new top end has resulted in a leaking thermostat joint. I carefully masked off both mating surfaces of the head and joint before I painted them. There are no gaskets between them so is the thermostat gasket (it didn't look very fresh) what makes it stay watertight? I've cranked the bolts down too.

[hondaror]

A paper gasket.

[squish]

False alarm. Clamp to filler hose was not properly placed. All good now!