Is the high temp base coat need to be cure the same way as the high temp epoxy? If so how how long do I have to post cure it?

Yes, to acheive its high HDT (Heat Distortion Temperature) the High Temperature Epoxy Skinning Basecoatwould also need to be post-cured at elevated temperatures. The post cure schedule is the same as that for the High Temperature Epoxy Laminating Resin. You'll find the recommended post-cure schedule on the Datasheet for the High Temperature Epoxy.

Matt Statham
Easy Composites / Carbon Mods - Technical Sales