Is sealant really necessary on a thermostat gasket?

Aaron65 said

I like using Permatex #3 (aviation sealer). It cleans off easy with solvent (unlike some other gasket sealants).

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Anymore, I'm a fan of the old school Permatex sealers too - #2 or #3. In this case, I'd opt for a little insurance over a dry gasket.