With this gasket, I'd think if it's all rubber, one doesn't need any other sealers?..
The instructions in the Felpro gasket package suggest a light film of silicone at the four corners. I also put a small bead of silicone between both the gasket and the pan and between the gasket and the timing cover/rear seal housings. Some of this might be redundant or even unnecessary but when it comes to leakers, it's better to take a few extra steps than to omit one and regret it later.
Still remember to check the corners for gaps like in my first post..