The data sheet talks about applying other releases and sealers, and fully curing them, prior to applying 770-nc at room temp. to 60C. No mention of curing, just applying several coats and letting the solvent flash off for 5-10min. between coats, then re-applying as necessary to maintain release.
770 is a moisture curing material. It reacts with atmospheric moisture to chemically cross-link (cure). Almost all chemical reactions are accelerated by heat. Degree of cure (completion of the reaction) depends on time and temperature and rarely reaches 100%. You will almost always achieve a higher degree at higher temperatures than can be achieved at lower temperatures, regardless of time. Any reactive groups left in the release coat can potentially react with the resin that you are molding, which results in adhesion.
Curing the release at 60-80C would certainly help but may not be absolutely necessary. However, almost all release problems occur on the first molding cycle after a mold has been coated for the first time. So the first-time treatment of a mold should be five applications of mold release and then one temperature cycle up to the cure temperature that will be used in production. Keep in mind that autoclaves are pressurized with compressed air or nitrogen, which is very dry.
That is correct. As I said, when release problems are encountered it is almost always on the first time run of a tool (mold). The common advice that I have heard is to use five initial coats. These coats are very thin and no visible liquid should be left on the surface after the each application by using a dry buffing cloth and then allowing a cure period. It is not a common practice, however, to bake tools at part curing temperatures prior to the first molding cycle. This perfectly explains why first time cures on tools are so problematic.