If it is rubber gasket that is in good condition (tight fit, pliable, etc.) then you do not need sealer on it (you may want to use sealer to "glue" the gasket to the valve cover so it stays on the valve cover when you remove it later). I have used Permatex Ultra Copper for years and like it a lot - use the least amount possible (a little goes a long way) to prevent excess squeeze out.
Good Luck!
Tom
__________________
America: Land of the Free!
1977 300D: 300,000+ miles
American Honda: Factory Trained Technician & Honor Grad.
Formerly:
Shop Foreman;
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.
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