hanor

I made a white clay slip with specific gravity 180 yesterday for solid casting ! (idk how to say it in english , i mean slip weight waa 180g when water 100g) and I added about 1.5 times more of the the release agent(Sodium silicate )than usual.. But unexpectedly, the slip stuck to the mold. I thought this was a phenomenon when there was a lot of water in the slip. Or does this happen depending on the drying condition of the mold? plz help me...