restoring factory chrome valve covers help needed

They sell a rubber product for hand tools where you basically dip......say the handles of a set of plyers........into the product and let it dry. It puts a rubber coating on the handles for user comfort. I would imagine you could simply paint this rubber product onto the tabs with a brush to simulate the original coating. The product comes in colors as well as black.
Do a Google search for it and maybe it'll turn up. I cannot remember the name of the stuff.
Good Luck.

George