Thanks for the tips and info.. and cool idea hersute.. They just never fit my head properly enough to use.

With the plastic molds i was thinking of just spreading it around your bald area only and not going into your own hair, that way there would be no cutting etc. necessary. Maybe I am wrong and it doesn't work that way.. Just figured you don't need a mold of your entire head, so why not use less and just spread it around on your bald scalp only.