Ya. Didn't have as much luck as the OP and I'm using some rough/porous rocks. Time to go with an epoxy solution on the rocks. Light coat of epoxy with a brush or via a spray bottle and sprinkle the moss on top. Let it dry, and voila.
If you don't have a lot then just tie it on with thread. That way will grow for sure. The method in this thread is more for a situation where you have a large amount of moss and want to cover a large area quickly.
Here's my situation: Yesterday, I've cut up (instead of grind) my fissiden into really really small pieces. Then I put it back into my tank directly under my light (which i would leave on for the duration of this project).
I then decided to put an existing driftwood I had into this (dry) tank too. This driftwood has java moss tied to it, and I was hoping this process would allow the moss to attach and root itself into the wood.
Well, this morning, I went o check on the progress and have discovered mold developing on my driftwood...
Should I continue and let the mold grow, and worry about it once i fill the tank with water again? Or should i remove the driftwood? would it affect my fish once I fill it back with water and let them return?