With silicone oil 30.000 cSt, you can easily change the hardness / Shore (stiffness) and elasticity of pf very viscous silicone.
Kyosho #300000 Silicone Oil, 40cc : Home & Kitchen
PDMS DM 1000 cSt - /en
Room temperature characterization of a packaged sensor in 30,000 cSt
Σιλικόνες-Γράσσα
Silicone Oil 200 cSt - /en
Core RC Silicone Oil - 30000cSt - 60ml
350 cSt Eco-Friendly Silicone Oil – Eco-Friendly Silicone Oil & Fluids - EKO Sustainable Products
Silicone Fluid, 12500 Cst. – Z Chemicals
Factory Team Associated Silicone Diff Fluid 30,000 cSt #5457 2 fl.oz. 59mL