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[knowyourplanet]

Originally Posted by Sizz

P-4 from Silicones, Inc.

It's a clear 2-part (10:1 ratio) platinum cure. It's very similar to sylgard (viscosity & cured hardness). 2lb kit costs $43.20. So about half the cost.

I do not believe this compound is UV stable and would yellow over time unlike Sylgard 184 and Qsil 216