It's not molybdenum disulfide, which is an oil based anti-seize, but another similar product available from Nissan and BMW for sealing EFI Throttle Plates. In EFI it is critical that all the air pass through the proper metering orifices and control devices. On ITB's this can be critical. If you can't get the plates sealed well enough, you end up with a minimum idle of like 1700 rpms!
Carbs are not sealed with this goop, mainly because you will likely goop over the idle and transition ports in the body (though stopping short of that area may be a way to use it. Throttle Bodies are gooped up, almost mandatory on them if you want a 'soft seat' and a plate that doesn't stick.
Beware letting plates 'slam shut to seat' as well, that's how they stick, and consequently on re-opening how the throttle shafts get bent in the first place!
They will settle closed by light nudging of the shaft and letting them jiggle into place. Then they are prevented from EVER reaching that point again by the idle speed stop screw. Guys who back the ISSS out fully then snap the throttles from the accelerator pedal usually end up with synch problems as the throttle shafts bend torsionally from the throttle plates sticking in the bores when snapped fully shut!
Precision is the key here, not my Avtar.
Misanthropic Anthroparion Class 5 Hoarder, aspiring to posthumous fame as my containers are cut open and the market floods with crap I've squirrelled away over the years! I endeavour to persevere...