According to Silipint, food-grade natural silicon is not only non-porous and tasteless, but also odorless. However, the site continues to explain that its products might put off a new car smell, like that of rubber, that dissipates with time.
According to PH Sealants LTD., Acetoxi silicone sealants smell like vinegar as they cure due to the releasing of acetic acid. However, neutral silicone sealants have almost no smell and release alcohol when curing. Silicon is included with group 14 in the periodic table of elements and is part of the carbon family, as are tin, germanium and lead. Silicon is contained in many minerals and rocks and is never a free element, meaning it is always part of a compound with other elements.