silicone

Does anyone know where I can get 100% silicone? Most selants seem to be quick dry (which is not 100% silicone) or else they don't specify.

Hi In the past I've found a lot of solutions to problems on here, much appreciated. This is my first post. I've just finished installing a sink, behind it is emulsion paint. I applied silicone sealant around it which seems to have leached into the paint behind. It's not water from the taps...