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how can I make latex? Answered

I need this for movie making type things, liquid latex would be best


If you really want to make it yourself, start by growing a rubber tree...

What I believe you're looking for is called mask latex, and it's relatively inexpensive.  This site has a good information and links to supplies for making prosthetics:  http://www.fxsupply.com/, and you can find some pretty awesome finished designs here:  http://www.latexmaskcentral.com/