The Seiko Silicon Grease TSF-451 is a lubricant excelling in water-repelling properties. Use on silicon gaskets which will prove to be highly effective in waterproofing. For crown gaskets, use a tiny amount.
Well, it's factory original Seiko watch gasket Silicone Grease. Given that it has a tendency to leak out even though it has a very high viscosity rating but not enough to keep some from seeping through the edges of the container, the container itself comes wrapped in plastic. Therefore I recommend that you simply set it right side up for a couple hours before opening so it has a chance to settle before using. Otherwise, you might have a bit of a mess. It is however the real deal and works exactly as it should and for a fair price. Like I said, it's the gooey good stuff. Probably enough in one container to easily do 50 or more gaskets. It should be used sparingly.
Great material for the experimenter and professional alike!
This is a great optical coupling grease. I use it to mount a scintillation crystal to the face of a photomultiplier tube. This material is of high quality and much better optical properties than silcone oil sold elsewhere.