Sculpt Gel comes with three componentsA, B and C.
Parts A and B are the two silicone components which need to be mixed together thoroughly to cure.
Part C is purely a softener, and is clear.
Using a clean spatula or wooden tool for each material to avoid cross-contamination, scoop out equal sized blobs of parts A and B onto a clean surface.
You can mix these two parts together and use it as is, or add some part C to soften the mixture further.
A palette or a ceramic tile is good to mix on, as these can easily be cleaned and reused using a little alcohol on a cotton wool pad or tissue.