http://www.willswing.com/blogs/PilotBlogs/tabid/38/EntryId/389/Opening-the-mold.aspx

After repeating the process for the back half of the mold, this
morning I went out to the shop and separated the mold halves to see if I was
successful.

The anxiety with molds, especially multi-part molds, is the investment of time.
You have to completely finish the project before you can know if the very first
layer of gelcoat actually cured out.. or if the plug was prepped well enough to
release from the tool... or if print through has ruined the mold surface... etc.