I am quite sure you are correct. 90% of my mounted plants are mounted on the natural surface. I simply have people who want their plant mounted on the epoxy side (they love to see the rich wood surface), so 10% are mounted that way. I only use that epoxy side for mounting IF the wood is beautiful when epoxied. When roots do grow on that surface, they attach firmly. About the only thing I use clay for is my Phal. If I have to re-pot, I just use a larger clay pot and sit the old pot in the new one, with orchid media filling in the space. If I have a really big, really top-heavy plant (my personal plants), I will use clay for those as well.
