"Inhibition" means that your silicone has and will not cure properly. Instead of curing to a solid state it remains whole or partially liquid, despite the components being mixed in the proper ratio - in other words a goopy mess.
"RTV" stands for "Room Temperature Vulcanization" - which basically means that the silicone does not need to be subjected to heat to cure.
There are two main "families" of silicone - tin-based (also known as "condensation cure") and platinum-based (or "addition cure") silicone. In each "family" you can find a wide variety of silicones, with many different grades of hardness, softness, curing and working times, elasticity etc. But in general, all tin-based silicones share a certain set of properties, and all platinum-based share certain properties.
Silicone is a great, versatile material which can be used for making molds, casting in molds, or building up over forms.
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