The best way to describe it is its just like Dow Corning 732 Silicone in a gun tube, except it never ever goes hard. It's thiker and stickier than grease. Trust me the first time you use it you will thank me long time like one of those oriental hookers "love you long time"...... it is that good.
I use it to lube ALL rubbers, o'rings, gaps between the oil lip and dust seal on front and rear mains etc, even the rubber washers that go on the through bolts...
Post back when you use it. Don't use it on the oil control ring rubbers though, cause the oil control rings will pop out all the time when you are assembling the engine you are working on, apart from that little tip you will love this stuff. I have been using it for around 16 years now.