I think I saw this done in a thread on a tank set up but I can't seem to find it again. Does this work? I have a large odd shaped piece of driftwood I want to attach moss and I don't think thread would work. My next thought was to drill some small holes and use doweling to hold some mesh down over the moss. Any ideas or comments.
The moss that has glue directly on it won't live, and it might be rather messy, but I bet it would work well enough. Superglue is aquarium safe - I used to use it to glue coral frags on rocks at my old job. Even just squirting it underwater works.
For tricky pieces of driftwood I've also used a staple gun. Before too long the staples rust over and you can't even see them - and so far I've done it in LOTS of tanks and never seen a problem.
You can also get the really long staples and use a non-electric gun so the staple doesn't go in all the way, and then slide rhyzomes and roots under it - works great for anubias or java fern Just tap it in firmly afterwards, being careful not to crush the rhyzome.
I have tried it with riccia and it will not work becasue the riccia in contact with the glue dies, and the rest floats to the top. I bet it would work with moss though since dead moss isn't as delacate as dead riccia that just turns to mush.