.... I agree with Joe H. guys. Unless your a mechanic you will not likely to ever have to pull a pan, or intake, off in our lifetime if we do the job right and while we age the chance of leaks all over the drive way or in the garage are lessened.
We've used it on racing engines and once the pan is in place you get pretty good after a while wiping the edge of the pan to leave a pretty and smooth seal that will withstand a lot!!
I DO use gaskets and I usually make individual choices on different jobs.....
Just my .02
