In this tutorial we explain a volume formula for a basic block mold and how to convert the cubic inch volume into the right amount of silicone for your project. We also explain the basics of why you would choose a firm silicone or a soft silicone.
5110 Silicone: https://bjbmaterials.com/tc-5110-a-b
Zip 301: https://bjbmaterials.com/zip-me-301s-release-spray
TC-800: https://bjbmaterials.com/tc-800-a-b/