Hi folks, I am attempting to create a waterfall effect using woodland scenics water effects. Now, I have tried spreading this white paste over acrylic perspex and glass; thinning it out to create a water effect. In a video I watched by Luke Towan, the guy just peeled it off after it was dry, but for the life of me, I can't. It's stuck fast and I can't get it off. It just chips off. Has anyone had a similar problem? Thanks