It needs to be Cyanoacrylate glue. I looked up the above, and can't find the data sheet for that exact product. However, Gorilla Glue Super Glue will work and is widely available in the UK.
Yeah it is Cyanoacrylate (it’s written on the label) but it must have an additive in it that prevents the reaction.
Have you used the Gorilla glue with filters then? Is it runny enough? I’ve used the thicker stuff for plants, but not the other?
Yes. I did this to attach round river rocks to the bottom of a piece of wood that wouldn't sink. Very effective.
I'm keen to discover any innovate techniques for retaining the soil in island style aquascapes that have a thin layer of surrounding cosmetic sand
I pretty much bond the rocks together or construct the hardscape in such a way that hopefully it won't move too much
Perhaps a bit counterintuitively @Wookii the only method that’s really worked here is simply using hardscape to plug the gaps. Buying some sacrificial rocks of whatever stone you’re using and hammering it into varying sizes. As you tip in your soil at startup, add in rock fragments of varying sizes and letting them settle into the gaps.
As @Tim Harrison previously mentioned:
You could silicone the main hardscape together (Reef type silicone or JBL Pro Haru) so it’s effectively one piece then plug the gaps with varying sized stones. Amano pulled this trick in all those videos from the Skytree tower exhibit in Sumida.
Since employing this method, barely ever get any soil leaching out even compared to the filter floss method, which is odd, as you would think a barrier of floss would be superior.
I don’t want the rocks bonded too permanently in case I decide to rescape in the future