Firstly, you should know tin is “tin cure silicone” and platinum is “Platinum Cure Silicone”.If you choose the wrong one it could mess up your costly master beyond repair by not curing against the substrate material and remaining sticky no matter what you do.
LET'S RESIN Silicone Mold Making Kit, 30A Liquid Silicone Rubber, 32 oz Non-Toxic, Odorless - 1:1 Mixing Ratio Silicone for DIY Resin Mold, Casting, Candle Making Molds, Soap Making Molds(Blue) – Let's Resin
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Polytek TinSil 80-15 Tin-Cure Silicone Rubber - AFA Supplies
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Choosing Tin or Platinum Cure RTV Silicone When Making Molds
Choosing Tin or Platinum Cure RTV Silicone When Making Molds
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AM 125 Simple 1:1 Mix Silicone Rubber - 1/2 Gallon Kit - AeroMarine