I use bog-wood now, they are heavier than water when wet, and I like their dark looks.
I used drift-wood before. To get rid of their buoyancy I used to drill a hole, used a plastic knitting needle as a nail, put the head through a hole in an appropriate stone like your slate and heat the 'head' of the plastic nail and shape it into a rivet.
Is there any special reason not to drill a hole?
If there is a small crack or crevice on the drift-wood, you can try forcing a bit of epoxy putty into it and attaching the putty to the slate with aquarium silicon after the putty has cured.
p.s. I collect my own bog-wood and drift-woods.
Last edited by essabee; 01-30-2007 at 04:37 PM..