Yeah i know. First test pieces with this technique were not so promising. I used to much water modeling and made the layer to thin. I created bubbles and the Apoxisculpt didn´t adhere to the Worblas. It broke and fell of.
You need to make the layer thick enough (around 1.5 to 2 mm) and you should sand the Worblas with a rough sandpaper to create a rough surface on which the Apoxisculpt can stick. (it is only needed with bigger surfaces) And don't youse to much water because it gets brittle and creates bubbles on wide and thin layers.