its non setting gasket sealant - have you ever used dirko compound? or permatex no.2?
its close to that, its actually a threebond product on japanese cars but cannot be used alone. I'll try to get the part number for you. It was sold in Karachi when I lived there - but later simply used hylomar for all such jobs which was also sold in Karachi. Its great stuff.
Its used to stick the gasket in place only, not to act as primary seal.