I use a substance called bathroom silicone. It is really soft like tooth paste. For non-slip material I use a piece of what is used to hold smaller carpets away from sliding around the floor - a kind of material with a rubber coating.
- Kim
You should be able to get a caulking tube of silicone at a place like Home Depot or a similar store fairly easily. I've been debating for when/if the day comes to mount my Choseras whether to use silicone or epoxy, the former should be easier to remove if ever needed too
The silicones stays relatively soft (doesn´t harden) so it is possible to cut through it with a knife. This way the stones can be cut from the bases if needed.
- Kim
I have used epoxy and and as support 10mm thick hard PVC (not so heavy) or piece of counter-top material (that 'artificial stone' stuff). The idea with the silicone is interesting though.
I think a stable material like counter top offcuts are better for mounting as they will not swell or warp when exposed to moisture like wood can. I used 2 part epoxy and a piece of granite on my crumbling JKI 6000 S&G as a permanent fix. You can just use a wet rag for anti slip or something like this:
If I remember correctly, silicones react like acids until hardened. Some special purpose ones have different pH. I don't know whether this matters, but it might be worth a look.