So, I've now attempted twice to make my silicone face prosthetic that I am making for a short film...its Chewbacca-ish! I followed all the directions on paper & the smooth-on videos to the letter. Both times it came out beyond sticky and not really solidified...meaning, I could alter its shape simply by pulling on it and it didn't go back to where it was meant to be. I'm wondering if it's the Slacker at this point? When I do the mix up for the encapsulate membrane, what hardens in the leftover cup is perfect....why does the slacker worsen it...I thought it was supposed to help. Should I just make it without the slacker?