Perfect craft Mold Mold Making Material for Customized Detailed Molds

What is the difference between the plaster, the mold and the casting powders, which would be the best to use in ballon projects?

What is the set time on the cast? I’ve tried one that sets in 2 minutes and one that sets in 4 minutes. Both serve a purpose.

I'm trying to create a fin that is missing on a plaster statue. can i use and then pour epoxy in it to create? can i create the mold with this?

Can this be used to make dental impressions of teeth?