I have listened that you can use vaseline, spreading it with a brush in the dried first part of the double mold, before you spill the rubber for the second mold. After the second part dries, you can detach easier the two parts to remove the model and proceed to spill the plastic.
Is it correct? Any advice?
Many sorries for any mistakes, my english are bad, I will try correct em if the post is not understandable..