If surfaces are clean and not distorted/damaged, you should not need it.
If you are worried or know the mating faces may be imprefect to the tiniest degree, a small smear wont do any harm. Make sure you use a sparing amount of proper gasket sealer appropriate for the gasket (along the lines of blue hylomar) not silicone, not sh1tloads.
And as ever, dont overtighten!
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