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Message: <blockquote data-quote="user 92" data-source="post: 32550" data-attributes="member: 92">I do use silicone on thermostat housings and water pumps, etc. But I apply it to the gasket with my finger, and that is just a thin film. As thin as I can make it. I also squirt a dab at the corners of 2 mating surfaces. Like where the valve cover has a hump over the cam shaft. I will use a small dab of silicone at those corners. But if I ever came across the need to add a sealer to a head gasket for some reason, I'd use the spray stuff like you used in your video. Not silicone from a tube as we know it. There are some automotive oil pans and valve covers, etc. that use silicone instead of a gasket. You call the dealer and ask for a gasket and they deliver a tube of silicone. Because that's what it is. There is a place in the world for silicone. But I have yet to see that place on a head gasket. In fact, if I had an old head gasket that required the use of a sealer because of older technology, I really think I'd "feel" better upgrading to a newer, more modern material. (depending on what's available) Personally, I kinda favor the graphite types, although they are more sensitive to proper clamping forces. (torque and torque sequences and such)</blockquote>