With the intake, I wouldn't dare comment, but as for cork gaskets, they are supposed to be installed dry without sealer. If you gentlyh lift the part, the gasket pops loose. As far as how long gaskets will last: gots me a 20 year old set on my car's rocker covers. Had the covers a few times. They never leaked a drop and still don't leak a drop. Based on the condition of my 20 year old cork gaskets, if I were to speculate the lifespan of correctly installed cork gaskets, I would say about 50 to 75 years.