Lets go... Is a very common product. If you write "liquid silicone" on google you will obtain a lot of suppliers. In Amazon
(example
http://www.amazon.com/QSil-Clear-Liq.../dp/B005RYI7C2)
Ebay
(example
http://www.ebay.com/itm/High-Strengt...3D370875484667)
Is a very cheap product, used for moulding ... uf, my poor english...the "like stone engraved concrete", gypsum decoration ceiling (
http://0.static.wix.com/media/20d1fa...95.wix_mp_1024). Sure that in your town you can find a supplier! I see two type of silicone: two liquids for mixing 1:1 and for mixing 1:10 to 1:25. I used only this last.
A secret tip
Do you know the special "no play" grease that the telescope builders put in to the focusers? Is this silicone, but without mixing with the catalyst