You can use a thin layer of gasket sealer/maker to stop wicking on the paper type gaskets, thin bead of ultra black or grey spread out with your finger on both sides.
Ive been using the chrome T-stat housings with an O-ring for 20+ years that work great, no leaks and can be reused many times. If/when the oring flattens out, just buy a new one at a hardware store for a dollar. Might not look factory correct but for many cars with chrome/aluminum parts, factory correct doesnt matter.
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