I will use a light film of sealer on the j pipe side of the gasket, but I have successfully sealed turbo outlets without a gasket using only sealer. One more tip is I like to let the silicone set up for a little bit, like 15 min before installing the gasket. It allows it to " thicken" a bit and prevents it from squeezing out. Remember, I said thin film. If it squeezes out your using too much.