Addition cured silicones (platinum catalyst) do not require moisture or open air for it to fully vulcanise. These silicone are designed to cure at room temperature, however heat can be used to accelerate the cure if required, without any detrimental effect. Minimal shrinkage(if any) occurs with these rubbers. These silicones generally have specialised features (i.e. can be used with food, resist higher temperatures etc) Addition cured silicones will not cure properly if poured onto items containing sulphur (such as some sculpting clays). You are required to be accurate with your measurment with these RTV 2 silicones as they  are prone to fail if not done so correctly. Addition (Platinum based) Silicones Sort By Default Title - A to Z Title - Z to A Price - lowest first Price - highest first Time Added - latest first Popularity - most popular first Sales - best selling first M4601 A/B Addition Cure RTV-2 Silicone (1kg Kit) Addition cure General Purpose Silicone $88.72 Out of Stock Pinkysil Fast Curing Mould Making Silicone 500gm kit $47.95 Out of Stock Plat 10- Liquid Silicone 1:1 ratio 2 lbs / 908 grams - Food Grade FDA177.2600 Easy use ideal for making soft moulds with intricate detail A platinum-based 1:1 mix ratio (by weight or volume) silicone mould making rubber... $93.95 Out of Stock Plat 25- Liquid Silicone Shore 25A 1:1 ratio 4.54kg / 10 lbs Food Grade Safe. Easy to use soft silicone for mould making A platinum-based 1:1 mix ratio (by weight or volume) silicone mold making rubber... $340.00 Out of Stock PlatSil Gel-10 1kg $121.00 Out of Stock PlatSil Gel-10 200gm $36.20 Out of Stock Platsil Thixo 100gm $25.00 Out of Stock Trans 40 Translucent Silicone Rubber 410 grams TRANS 40 silicone mold making rubber is translucent platinum base silicone rubber... $26.25 Out of Stock TRANSIL - TRANSLUCENT SILICONE RUBBER 2kg Transil - TRANSLUCENT SILICONE RUBBER Two component addition curing, low viscosity... $143.00 Out of Stock