Once the silicone sets up I create a mixture of 65% Ecoflex OO-20 to 35% Slacker, along with some flesh and red pigment, and do the big pour. The slacker makes the mixture extremely soft and sticky and is the reason why the black inner mold was completely covered in a thin layer of 100% Ecoflex. The outer part of the insert will be this sticky silicone since it's not coated and this is done on purpose so the insert does not move when inside the doll. You can also see the little 3d printed funnel used to pour the silicone into the mold. There's a breather hole on top of the mold as well...another critical piece to this effort.
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After a few hours demolding can occur. The petroleum jelly makes this fairly easy with both the labia and the main insert, and since the shell is composed of 4 pieces, it does not break and can be reused. The inner insert doesn't survive though. It breaks when I'm removing the outer shell but it's not a part I would reuse anyway. There are holes on both sides of the insert at this point and I just slowly roll the silicone back onto itself to remove the inner mold.
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I then trim the two silicone parts and get them oriented for bonding together with 100% Ecoflex and some thi-vex, along with the flesh and red pigments. I mix up 4g for this step and all told, it takes 12+100+4 = 116g of silicone to make one of these inserts. After all the trial and error and wasting a lot of the original Ecoflex and Slacker, I was able to make 4 fully-working inserts. For reference, the $35 EcoFlex and $30 Slacker purchases provided 1300g of material in total, so I used a lot during the learning process and to prepare the cavity inside the doll.
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I spend several minutes with the thickened silicone and a toothpick to smooth out the edges of the labia that were not perfect due to the poor quality of my poster tack sculpture. I fill in voids and add structure where needed. Getting the right amount of thi-vex for this step is critical since I don't want the silicone to be so thick that it will not create a smooth surface, but also not too thin so it will stay in place. To achieve this I put a single drop on plastic and dip a toothpick into it when mixing the small 4g batch of silicone. So only a small percentage of a drop of thi-vex will result in the necessary consistency.
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After this last batch of silicone cures the insert is complete! It's very soft and doesn't have much structure, so I use a paint brush and soapy water to help slide it into place. I use paper towels and 2 aquarium air pump lines to dry out the soapy water used for this step and since the insert is so sticky and designed with almost no clearance, it's a semi-permanent installation. Cleaning is done with a custom solution shown here
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I have no idea how long these will last but will report any interesting happenings when they occur. Who knew repairing a torn vagina would lead to all of this lol
