silicone advice!

Hi! I have made a design that I would like to make a silicone mask out of (see picture below). Since I will apply the mask on myself without anyone's help I would like to do a full bust. I still have to sculpt the clay onto my life cast, and some problem areas like the nose, eyes, and mouth...

Hey all hope you're all well. I'm trying SMOOTH-ON a two part Silicon rubber for the first time. Everything went well and I thought I had enough but as it turns out I was a bit short. I was not able to complete the mold and have about an inch or so undone. Can I add more at a later time, say...