I tried combining caulk and cornstarch back at the beginning of my 100% Silicone Caulk mold making adventures and it was dismal failure. It never set completely and ended up sticking to the sculpture. But the more I did research into the casting and molding world the more I came across articles and videos
Making a cheap mold for epoxy from Silicone corn starch and oil! Handyman
Transparent Clear Platinum Cure RTV2 Liquid Silicone Rubber For Jewellery Molds
a DIY Hand Cast? 😍 Since I'm making a mold out of my hands
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Mold Armor 10-oz White Silicone Self Leveling Caulk in the Caulk department at
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MOLD ARMOR 100% Mold Free Caulk & Sealant (Clear) is a durable mold and mildew-free silicone Flexible, crack-proof formula with excellent adhesion and
MOLD ARMOR 100% Silicone Mold Free Caulk & Sealant (Clear), 5.5 Oz.