Hey again everyone, I accidentally forgot a question. What are the 'registration keys' for on the mold?
Registration keys are "notches" in a two-part mold that allows you to line up your mold pieces together when you are laying up your fiberglass/liquid plastic/resin.
Example of Registration Keys are seen in this (the circle notches all along the side of the cast): One side is "male" the other side is "female":
Here are some links discussing how to do registration keys for your mold:
http://www.smooth-on.com/gallery.php?galleryid=098
http://www.reynoldsam.com/gallery.php?galleryid=455