Recommendation Wanted: Valve Cover Gaskets

I use cork or black felpro type gaskets, coat them with black RTV and let it get a little tacky before installing the valve covers. Apply masking tape to all of the cylinder head contact surface...then install the valve covers. Let sit overnite, Remove the valve covers and remove the tape from the heads. The rtv stays on the gaskets, wont stick to the masking tape as it sets up, and helps provide a leak proof seal. Works for me.