5 bolt valve cover leaks

I have B1 heads, I am pulling off the valve covers a lot. What I do is: Glue a rubber style casket to the valve cover side with rubber trim glue. Then believe it or not I use front wheel bearing grease, for the head side. I doesn't leak. I have tried vasaline but I needed it else where! It was actually thinning out with the heat. You don't need a lot of grease either. MAKE SURE you have a good e vac system or breathers or a pvc system. Using an off set Master Cylinder plate from Mancini sure helps for big block valve covers to go on and off. I have used this valve cover gasket idea for 20 plus years. Good Luck.